10-06-2019, 02:03 PM
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#1
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Senior Member
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Join Date: Sep 2015
Location: Kansas
Age: 28
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Time to Build Custom Exhaust
Now that I can weld an exhaust together myself, what do you guys think would be the best setup for my V8? I've been doing some research and there is so much contradictory exhaust info on the web.
Dual w/ x pipe or single w/ y pipe?
I just don't think a dual system will provide much gains over a proper single system, add more weight and cost, and maybe only sound a little different and have cool dual outlets. If you think of exhaust flow as separate gas pulses, a dual 2.5" won't flow more or scavenge better than a single 2.5" system with a good y pipe merge. And if I supercharged or want high rpm gains I could still go single 3".
I've yet to see any dyno graphs showing a difference between the two. I might be able to set up a jig and build these for you guys, and could even dyno test a difference between dual/single but if there isn't a power difference between them, it would just be double the weight and cost of a single system.
How would we setup a dyno test, have two prebuilt systems one with equal length piping to the y and one with equal length piping to the x, and use all the same mufflers. Swap the systems out between dyno runs, disconnect the battery, drive around the street for 10 minutes, then re-dyno it? I could even test equal length vs normal y pipes.
I'll build equal length piping after the headers to either the y or x to increase scavenging potential but with the odd firing order of the V8 it will only help 3/4 of the firing sequence unlike the V6 where it alternates between cylinder banks 100% of the time.
So would it be worth to test any of the following? What would you guys like to see?
equal length vs unequal length
2.25 single/dual
2.5" single/dual
3" single
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
Last edited by Inv4drZm; 10-06-2019 at 07:17 PM.
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10-06-2019, 06:52 PM
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#2
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Senior Member
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Join Date: Oct 2013
Location: illinois
Posts: 1,608
Real Name: Ron
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Senior Member
Join Date: Oct 2013
Location: illinois
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Real Name: Ron
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Keep us posted on our progress!
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10-07-2019, 04:48 AM
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#3
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Senior Member
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Join Date: Oct 2011
Location: New Jersey
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Real Name: Ed
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Senior Member
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Maybe baseline dyno run(s) with the current Dirty Deeds exhaust, what's the pipe diameter of that system?
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10-07-2019, 10:11 AM
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#4
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Quote:
Originally Posted by Ed_C
Maybe baseline dyno run(s) with the current Dirty Deeds exhaust, what's the pipe diameter of that system?
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I think its 2.25" but I'll have to check.
Edit: it's 2.5", tailpipe section is 2.4" or 60mm. Y pipe is tiny at 1.9" and it's double-walled so at least 1.5" if not smaller.
I don't know if it will tell me much because I have the rear cats deleted so a somewhat hacked y pipe with non-mandrel bent tubing.
If I could find a stock y pipe to install for testing that would be a more fair comparison, I can get my hands on a free Gibson system from a buddy so we could do a test of an off-the-shelf catback, stock y pipe, and long tube headers.
I really think equal length piping after the headers before the merge into a y or x will be the best system possible so testing the stock y pipe will help prove that. I just don't want to do a million dyno runs, and don't want to install long tube headers only to reinstall stock manifolds in between dyno tests.
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
Last edited by Inv4drZm; 10-07-2019 at 08:28 PM.
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10-08-2019, 08:24 PM
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#5
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Bought some Magnaflow goodies while they were 20% off. For research purposes.
(3) Magnaflow 12646, 6" x 6" Round Body, 2.5" Center/Center, 18" Body Length
(1) Magnaflow 12649, 6" x 6" Round Body, 3" Center/Center, 18" Body Length
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
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11-04-2019, 09:45 PM
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#6
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Join Date: Sep 2015
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From my build thread:
More work done today on the Y pipe, should be able to finish it up tomorrow.
Drilled out the corroded bolts on the cat flanges, if not for that I'd have the entire thing tacked welded together.
Got the Y finished this weekend, though I was worried it might take a few more hours on Monday to button it up.
I'd like to think at least some of my welds show some genius. If I could get perfect tube fitup I could just fusion weld everything (no filler) and move fast to keep the heat down.
I wondered all weekend what initial startup would feel like, it didn't disappoint. A surprisingly higher pitched tone, it sounds a lot different than any 2UZ I've heard, super happy with it. Exhaust vid coming.
Finally got this #*%*! out.
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
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11-04-2019, 09:46 PM
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#7
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Senior Member
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Join Date: Sep 2015
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Whipped up a catback yesterday.
Dirty Deeds 5" diameter 20" length vs Magnaflow 6" diameter 18" length.
Sound camparison:
With just the Dirty Deeds catback, no y pipe the sound was deep, and when I added gears interstate travel was a little noisy with the higher RPMS.
With the Dirty Deeds and fabricated Y pipe/gears the sound was higher pitched and interstate drone might have gotten a little more annoying.
With the Magnaflow and fabricated Y pipe/gears the sound is deep like the first setup, but interstate travel is quiet.
So surprisingly the Magnaflow muffler is quieter than the Dirty Deeds. I lifted each system in each arm and the Dirty Deeds system is actually like 5lbs heavier!! I told you guys that thing was stout! I actually prefer the angry 'flat plane crank' sound the Dirty Deeds/ Y pipe combo gave me over the basic deep rumble, I'm not sure how to fabricate a system that sounds like that.
Most badass 4Runner exhaust system? (Excuse the temporary lack of headers)
__________________
2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
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11-04-2019, 09:51 PM
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#8
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Bought a 12" disc sander and a fancy cutting jig/clamp for pre-bent elbows which should make fitup and replication a breeze.
Next step is to build a dual system utilizing the two same magnaflow mufflers with a custom fabricated X pipe.
Then create a jig to start selling these.
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
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11-04-2019, 10:33 PM
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#9
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Join Date: Aug 2019
Location: Utica MI
Posts: 128
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Location: Utica MI
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Nice work!
Just picked up a 05 V8. It has the famous Exhaust manifold leak. I am going to order the DT headers next week and I am in need of exhaust like this. I will take one of the Y pipe & cat back set up! I will PM you tomorrow to discuss this in further detail. Keep up the great work!!
HDHP
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11-04-2019, 10:51 PM
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#10
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Join Date: Sep 2011
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Looks Awesome man. Love the Work. Looks Top Notch.
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2003 V8 Limited 4x4 Black. JBA UCA's, TRD Pro Wheels. OEM LED Tails, 2012 FJ Springs F/R 5100's F/R 1.75 Cooper AT3 4S 265-70-17. Bye X Reas, Wet Okole Seat Covers Weathertech liners.
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11-05-2019, 07:40 AM
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#11
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Join Date: Jan 2018
Location: MA
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Quote:
Originally Posted by Inv4drZm
Bought a 12" disc sander and a fancy cutting jig/clamp for pre-bent elbows which should make fitup and replication a breeze.
Next step is to build a dual system utilizing the two same magnaflow mufflers with a custom fabricated X pipe.
Then create a jig to start selling these.
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Can you Please post a pic and some more info on that jig/clamp for the pre-bent elbows? I love doing metal fab, and something like that would be very useful for any tubing project, not just exhaust.
Your welding skills are coming along very nicely! I’m still researching multi-process welders myself because my little Lincoln mig just isn’t cutting it anymore. Definitely need a bigger machine, and the ability to TIG. I looked at the one you have, and I’m currently checking out the 2 higher end HF offerings, the Vulcan Omnipro 220, and the Titanium Unlimited 200.
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2004 black SR5 V8 4WD with TRD dual exhaust, Thorley headers, AFE dry filter, Sprint Booster, Icon 2.0 rear shocks, OME 895E springs, Fuel wheels with 265/70/17 Wildpeak AT3W tires, more to come...
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11-05-2019, 10:04 AM
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#12
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Senior Member
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Join Date: Sep 2015
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Quote:
Originally Posted by Terminator03
Can you Please post a pic and some more info on that jig/clamp for the pre-bent elbows? I love doing metal fab, and something like that would be very useful for any tubing project, not just exhaust.
Your welding skills are coming along very nicely! I’m still researching multi-process welders myself because my little Lincoln mig just isn’t cutting it anymore. Definitely need a bigger machine, and the ability to TIG. I looked at the one you have, and I’m currently checking out the 2 higher end HF offerings, the Vulcan Omnipro 220, and the Titanium Unlimited 200.
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Here's the link.
Elbow Cutting Jig for 2", 2.5", 3" OD & 1D/1.5D CLR - Sequence Mfg by Ticon
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
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11-05-2019, 11:03 AM
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#13
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Join Date: May 2015
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Real Name: The Native Explorer
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I'd totes m'gotes be interested in a y-pipe... Keep on keepin' on!
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"Bumble" '17 Lim w/ 35k, IVD Stage 7, CBI/Prinsu metal, Morimoto lighting, ARB Linx : Build thread in progress...
The AventuRunner Build '07 V8 Sport w/ DO armor, Fox squish, Falken rubber, IVD UCAs, BD lights, Sherpa rack -- gonna miss the V8
The "Iceberg" Build... Natty White 3rd Gen ----gone, but not forgotten...
IG @apohl17
From ye fellow @Konkordmusk... "The 4Runner does not drive. It simply rotates the Earth to your desired position."
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11-05-2019, 01:35 PM
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#14
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Join Date: Oct 2011
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Real Name: Ed
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Oooh X-pipe, can't wait to see what you've got in store. This guy has a x-pipe with "bullet" style mufflers https://www.toyota-4runner.org/3272358-post74.html so it's pretty raspy, your setup should be a little more mellow with those longer Magnaflows.
Last edited by Ed_C; 11-05-2019 at 01:38 PM.
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11-05-2019, 02:57 PM
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#15
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Quote:
Originally Posted by Ed_C
Oooh X-pipe, can't wait to see what you've got in store. This guy has a x-pipe with "bullet" style mufflers https://www.toyota-4runner.org/3272358-post74.html so it's pretty raspy, your setup should be a little more mellow with those longer Magnaflows.
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Man I am Glad I have the V8
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2003 V8 Limited 4x4 Black. JBA UCA's, TRD Pro Wheels. OEM LED Tails, 2012 FJ Springs F/R 5100's F/R 1.75 Cooper AT3 4S 265-70-17. Bye X Reas, Wet Okole Seat Covers Weathertech liners.
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