I have a 04 SOHC 4.0 and i was thinking of doing a muscle truck style side exit with duels and i was looking under the truck the other day and noticed that it seems like i have two cats then the pipes go into one pipe and another cat it seams... Is that another cat or is it a resonator?

Also what muffler should i use i was thinkin flowmaster but not sure what series to use?

Also i have this cross over thing that a guy at work gave me ===x=== it looks kinda like that... Its like two 45s welded together and a oval hole in the pipes and apparently it does something with the suction to help pull the gas out somehow... He has one on his monte carlo he got from Dr. Gas... He said it added like 15hp and also some Nascar drivers use it. Also Chrysler puts it on there performance models...... Should i put it on there too??

 

I think it is to make the pressure in both pipes the same.

 

i would personally save true duals for v8s.

flowmaster would be good. 40 or super 44 sound do fine

that seems like an x-pipe, its helps balance out the exhaust gas back pressure. looks cool as hell. im trying to talk my buddy to get it with cutouts on his project skylark

 

do it i want to do this to my truck too but im poor right now lol super 44 FTW

 

id say magnaflow i have a 3.0 and it sounds good i think it would sound even better on a 4.0

 

if your model has 4 cats just Y-pipe it with duals. Sounds Great on the 4.0 i had a 40 series before and it sounded alright 2 just quieter.

 

Yeah im poor now too...

Just trying to figure out what im gonna do next to my truck...



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Also my truck it looks like my truck has 3 cats....

 

true duels.. hmm.. would this mess with the back pressure at all?

 

Im not sure if it would or not

 

If you do go threw with it make sure you use an H or X pipe to even the flow. If not it will hurt your power big time.

 

Okay lets start here everyone:

1. its true DUALS! A duel is a fight of sorts. ha.

2. You need back pressure, if you wanna go true duals you best go header back and get all high flow cats and things of this nature. I personally like Zachs exhaust setup which is a header back.

 

Thanks I was just about to post this.

 

hahaha sry

 

Well the tittle i was okay with it, but after reading like 3 replies using it wrong I had no choice.

 

Haha my Bad i didnt even think abut it... Firefox said it was spelled right but it doesnt have a dumb @$$ feature so sorry for the wrong spelling... I am forever spelling it duel instead of dual

 

DO NOT go bigger on pipe dia if you do go true duals. I run a true dual 2.5" from headers back, mag cats, Dr. Gas X, Flow 44`s, exiting before left and right tires. Killed my torque. Truck is much slower now and I`m sc`d.

 

run like 2 inch exhaust at the biggest

 

Id say he would be ok sticking with the factory 2 1/4.

 

^^^ not with running true duals 2 inch would be better to keep some back pressure

 

The 4.0L is a short stroke engine. IMO if you have a stock long block.. keep the "Y" to maintain the stock backpressure. Do what ever you want to downstream of it.. which will sound good and relieve a bit of BP.

Opening up both sides IMO will only serve to raise the TQ curve. And on a stock short stroke engine in a pickup.. that's the opposite of what you want to do.

Rich

 

I wouldn't do true duals on a V8 let alone a V6.

 

why wouldnt you do them on a v8?

 

What for? You lose a lot if not all exhaust scavenging.