V8 Exhaust Advice (Cat-Back)

[Inv4drZm]

Been doing a little more thinking/research about what I’ll do when it’s time for my DT LTs. I want to keep it quiet while cruising/on the highway.

Anyway I have a rough idea for true dual - have the headers hit a fab’d 2.5” x-pipe and then through the longest 2.5” flow-through pair mufflers I can find (Magnaflow makes a 6” diameter x 27” long round one that should work) with some Helmholtz j-pipes to cut drone and route both tail pipes either out the passenger side either in front or behind the rear wheel.

Should be pretty quiet but loud on throttle I’m thinking. Anyone have any input?

I have the same setup you describe, except with an equal length x pipe and twin 6"x18" Magnaflows. I would say my setup is quiet on the interstate but I have large mud terrain tires that drown out a lot, and 4.88 gears which throw off rpms from stock gearing. For example it drones quite a bit at 60mph but not 70-80.

Without cats, its loud, but your 27" mufflers might help.

Check out my youtube for videos of my setups, I've been through a couple:

YouTube

Catless makes it smell like an old truck or atv, and added rasp. I might be adding two cats to deal with the smell, but I don't mind the rasp.

 

[KrazedJD]

I love my Gibson exhaust, perfect exhaust notes. While cruising its not droning you out and when you open up the throttle you get to hear the V8 come alive.

 

[Ed_C]

I have the same setup you describe, except with an equal length x pipe and twin 6"x18" Magnaflows. I would say my setup is quiet on the interstate but I have large mud terrain tires that drown out a lot, and 4.88 gears which throw off rpms from stock gearing. For example it drones quite a bit at 60mph but not 70-80.

Without cats, its loud, but your 27" mufflers might help.

Check out my youtube for videos of my setups, I've been through a couple:

YouTube

Catless makes it smell like an old truck or atv, and added rasp. I might be adding two cats to deal with the smell, but I don't mind the rasp.

Where do you think he got the ideas from? :bounce:

 

[Drift Monkey]

Where do you think he got the ideas from? :bounce:

Dirty Deeds? :fish:

 

[Drift Monkey]

I have the same setup you describe, except with an equal length x pipe and twin 6"x18" Magnaflows. I would say my setup is quiet on the interstate but I have large mud terrain tires that drown out a lot, and 4.88 gears which throw off rpms from stock gearing. For example it drones quite a bit at 60mph but not 70-80.

Without cats, its loud, but your 27" mufflers might help.

Check out my youtube for videos of my setups, I've been through a couple:

YouTube

Catless makes it smell like an old truck or atv, and added rasp. I might be adding two cats to deal with the smell, but I don't mind the rasp.

I wonder if the Helmholtz resonators would remove your 60 mph drone - kinda why I wanted to try them out.

Your setup def sounds awesome that’s for sure, but getting someone to fab an equal length x-pipe sounds...expensive lol. It might be easier (cheaper) to have someone fab up a x-pipe based on the typical y-pipe design (like URD for reference) and run the long mufflers after. If there’s any rasp I don’t like I could always add a couple tiny mufflers stuff the end to cut it down but I’d have to see how loud this would be I guess. Stock-ish highway exhaust noise would be ideal but I could live with a little...I just hate drone.

 

[Drift Monkey]

Another thought, could a dual-in/dual-out "x core" muffler function as a crossover? Might make true duals even easier. Thoughts [MENTION=130999]Inv4drZm[/MENTION]?

Magnaflow 12568: 5" x 11" Oval Muffler Dual In/Dual Out: 2.5" Body Length: 22" Overall Length: 28" Core Size: 2.5" Satin Finish | JEGS

Still learning a true X crossover pipe doe...seems like more room to add dual long ass mufflers/helmholtz resonators after.

 

[Inv4drZm]

Another thought, could a dual-in/dual-out "x core" muffler function as a crossover? Might make true duals even easier. Thoughts [MENTION=130999]Inv4drZm[/MENTION]?

Magnaflow 12568: 5" x 11" Oval Muffler Dual In/Dual Out: 2.5" Body Length: 22" Overall Length: 28" Core Size: 2.5" Satin Finish | JEGS

Still learning a true X crossover pipe doe...seems like more room to add dual long ass mufflers/helmholtz resonators after.

It would help make it quieter, at the expense of flow. Keep in mind the overall length, this style x pipe is relatively long, it may make you use shorter mufflers.

 

[Drift Monkey]

It would help make it quieter, at the expense of flow. Keep in mind the overall length, this style x pipe is relatively long, it may make you use shorter mufflers.

I guess my real question is, would a really short one work in place of a x-pipe or should I just stick to my original x-pipe to dual long mufflers idea? I'm thinking the original idea would likely be quieter due to more clearance for dual long ass mufflers haha.

 

[That_Titanium_4RNR]

Been awhile since Ive been up here. Ended up getting DT long tubes installed along with their Ypipe (which has the rattle and is getting warranty replaced), for a muffler Im using the flowmaster super 50 delta flow. Its plenty loud.

 

[Inv4drZm]

I guess my real question is, would a really short one work in place of a x-pipe or should I just stick to my original x-pipe to dual long mufflers idea? I'm thinking the original idea would likely be quieter due to more clearance for dual long ass mufflers haha.

I don't have any experience with those x pipes and don't know how much quieter they are vs a longer muffler. But I could see where a straight-through muffler, at a certain point, longer doesn't mean much quieter and maybe mixing it up a little with an x pipe 'muffler' might help sound more.

I've only gone from a single muffler system to a dual muffler system using 3 of the same mufflers. I haven't played around with length yet.