dual exhaust-3.0 ??

willyt4r

willyt4r

New member
Is a dual exhaust feasible on a 3.0? My thinking is that this would eliminate the heat build up on the crossover and add some breath-ability. I understand a 3.4 swap is the best option but my 91 only has 170,000 with a new head gasket ,belt and water pump at 150,000 . I get 17 MPG and the truck runs smooth. Just thinking:lookout:
 
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LC engineering makes some, but they're not cheap... Actually the 3.0 L seems to have really expensive aftermarket headers in general. Good luck!
 
IMO if you're going to do dual exhast you might as well go all the way. Maybe the first step would be a cat back? They sound good and i've heard they increase the performance a lot, and sound good depending on the muffler. Might be more cost effective, but if you do go the dual exhaust route, you should let us know how it turns out!
 
headers for the 3vz are like $1500 a pair! a complete waste of time, you could get a low mileage 5vzfe setup for the same price, just go with the cat back, remove the cat all together if that is an option...
 
Joehert said:
IMO if you're going to do dual exhast you might as well go all the way. Maybe the first step would be a cat back? They sound good and i've heard they increase the performance a lot, and sound good depending on the muffler. Might be more cost effective, but if you do go the dual exhaust route, you should let us know how it turns out!
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Increase performance a lot? Is the stock exhaust really that restrictive?
 
88T4RE said:
headers for the 3vz are like $1500 a pair! a complete waste of time, you could get a low mileage 5vzfe setup for the same price, just go with the cat back, remove the cat all together if that is an option...
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They are 650.00 a pair at summit.

The previous owner put some headers on, so I can't speak for the before and after affect. But I can say that my 4runner gets down the road pretty good and I have no problem cruising 75-80mph on the highway. And it going to the factory exhaust.
Im going to install a 2 1/4" exhaust with a magnaflow muffler soon.
 
I know this thread has been sitting for a while, but I just figured I would fire it back up with my personal experience with a 3.0 V6. I had an '88 Xtra Cab with the 3.0, and in the early 90's, I did exactly what is being talked about here. I removed the crossover pipe, and ran 2" pipes from the stock exhaust manifolds all the way back with glasspack mufflers (Cherry Bomb I beleive) and resonator tips with NO cats.

I had a friend who was working at a Toyota Dealership at the time as a mechanic, and he kept telling me that sooner or later I was going to get a blown head gasket as he saw first hand that many of the V6's that came into the dealership for this very reason. I did this exhaust mod at about 40,000 miles, and never had a head gasket issue till the day the truck was stolen with 220,000 miles. That's gotta say something!

Yes, it did give a bit more power, but it really helped out the gas mileage. I was running 36" Super Swampers, 5.29 gears, and still managed to get 19-20 MPG average with about 22 MPG highway. Could probably been even better had I gone with a set of headers, but why? Sure, it was a bit loud under load... but at cuising speed and idle, it was fine. I guess it was the volume that may have taught me to baby it up through the gears to allow this kind of milage... who knows??


Just offering my $.02
 
prevention of head gasket issue

Was reading this thread, as I hurriedly bought a 95 4 Runner just before Xmas for my daughter, whose current car had just crapped out (97 Jetta -- POJ). W ell I didn't due my usual due diligence, as I had always had good luck with other Toy models -- so here I am 3 wks later w a blown head gasket. (I suspect seller used a liquid sealer on an already blown gasket) So I am looking at $1500 - $1800 to replace head gasket/check head (and maybe more if bad things are found) or Rising Sun has a Long Block Refurbished for $1500 -- plus $800 for installation (Normally I'd do this work myself but I am 150 miles away, and don't really have the time) So I'm leaning to the new engine -- but my worry is that we'll just get another blown head gasket, as this seems to be a basic design flaw in this model re exhaust crossover? But I'm a little leery re mods on the exhaust, since I'm in CA, and have heard some horror stories re post-mod smog inspections. So any advice or pointing to another thread would be most welcome. The point being, what's the best/least expensive route to preventing another blown head gasket? Thanks from a newbie here.
 
i got lucky and got a used set of carb legal headers for a good price. getting rid of the crossover where all the heat builds up right at number 6 cylinder, also where most head gasket fails at from what other techs have told me that did the recalls on them. another thing is run the right coolant. toyota coolant is expensive but you only change it out every so often, much cheaper than a blown headgasket imo. also another thing is to make sure you have good grounds.
you should check to see if your headgasket recall as been done, call a dealer and tell them your vin. see when it was last done. if you can talk to the manager that it has been replaced fairly recent i guess and it blew again, toyota might do it for free again.. worth a shot
other than that i dont know too much. my 88 runner was made in the 1st half of 88 and didnt fall under the recall. i have been told the headgaskets before 1988.5 were alot thicker and somewhere along the way toyota cheaped out and made thinner ones. even the recalled supplied headgasket wasnt as good as the originals. my 4runner was bone stock with stock crossover for 225000 miles and engine never been open before i installed the headers. parents are the original owners.
 
So from my understanding, I can take my truck to an exhaust shop and tell them to eliminate my X over pipe and C.C and tell them I want 2.25" exhaust and get idk a flowmaster or borla muffler and It'll make get a little bit more power and help with the premature headgasket issue? I have 185k with stock exhauts and truck runs fine. I'll do anything to keep it running better longer.
 
slipknoter106 said:
So from my understanding, I can take my truck to an exhaust shop and tell them to eliminate my X over pipe and C.C and tell them I want 2.25" exhaust and get idk a flowmaster or borla muffler and It'll make get a little bit more power and help with the premature headgasket issue? I have 185k with stock exhauts and truck runs fine. I'll do anything to keep it running better longer.
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You're half right--no muffler shop is going to touch the cat. for you--federal law. If you want that gone, you'll have to do it yourself. There are high flow cat's out there, and they even cost less than a factory replacement. It won't hurt your performance at all, you'll help clear the air a bit for your grandkids, and it'll put the exhaust shop at ease. Everything else you mentioned sounds just peachy!
 
BucknutBob said:
You're half right--no muffler shop is going to touch the cat. for you--federal law. If you want that gone, you'll have to do it yourself. There are high flow cat's out there, and they even cost less than a factory replacement. It won't hurt your performance at all, you'll help clear the air a bit for your grandkids, and it'll put the exhaust shop at ease. Everything else you mentioned sounds just peachy!
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OK got, I am still a young grasshoppa at all this stuff haha, but heres one i found that doesn't seem bad

Amazon.com: Magna Flow 94300 Series Universal Catalytic Converters (High-Flow, Oval) Cat 2 1/4 Inch IN/OUT Cat 2 1/4 Inch IN/OUT (NON CARB COMPLIANT): Automotive
Amazon.com: Flowmaster 942445 Super 44 Muffler - 2.25" Center In / 2.25" Center Out - Aggressive Sound: Automotive
Of course i would buy a new O2 sensor as well and have them install that with the new piping haha
That would seem like a good set up, right?! Purchase those two items and go to a shop and say install these with 2.25" exhaust all the way down and take out my cross over X pipe correct? What will they replace the X pipe with a Y pipe?
 
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Excellent point, Kid V.! SK106, better call the shop FIRST and arrange this in advance. You should be able to find a smaller place that will work with your plans (I've had a full aftermarket system that I bought put in by one), but I'd call first before laying out the dough. You are correct regarding the Y-pipe. Best of luck!
 
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BucknutBob said:
Excellent point, Kid V.! SK106, better call the shop FIRST and arrange this in advance. You should be able to find a smaller place that will work with your plans (I've had a full aftermarket system that I bought put in by one), but I'd call first before laying out the dough. You are correct regarding the Y-pipe. Best of luck!
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Got ya, I was just curious if all that stuff would work. But I see what you guys are saying tho. Wander how much it would cost to have all that installed along with the new exhaust? Also hopefully this will clear things up for Willy as well. As of right now I'm waiting on my new clutch assembly to come in because I heard a loud pop the other day and my clutch assembly went to **** lol.
 
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