senicalj4579

iTrader: (41)

anyone know what companies make a 4" catback? i'm trying to find out all my options. thanks

theamxguy

iTrader: (2)

Mufflex is the only company I know of. Stainless works makes a 3.5 inch set-up, but the mufflex will out flow it. I have a 4 inch mufflex about to go on my car, but can't give any performance data, because I haven't tried it out yet. I do know it will outflow a true dual 2.5 set-up, but not flow quite as much as a dual 3 inch setup.

senicalj4579

iTrader: (41)

yup, thats thereason i will be going to a 4". supossedly a single 4" will suport 600-650 without any restriction. thanks man.

senicalj4579

iTrader: (41)

i meant to ask you, can you let me know how the clearance and install goes with the 4"? everyone makes a big deal out of the 4" clearance but i dont know how going from 3" to 4" can be that bad unless the car is to low. i wouldnt think it would be like everyone says.

theamxguy

iTrader: (2)

I'll try to give you a heads up on the install. A couple of guys I know have used the 4 inch mufflex on their cars and had no complaints about the install and fitment. One issue to be aware of, if you want your system to be max efficient, you need to be sure and use a y-pipe that is 3 inch and merges into a 4 inch collector to match the mufflex. Mufflex makes one as does Kooks, I was too ignorant to figure that out and I am having a muffler guy modify my 3x3 Kooks y-pipe. Good luck.

senicalj4579

iTrader: (41)

thanks man.

i have a 2.5" y-pipe but i should be fine cause i only plan on 450-500hp. 2.5" y-pipe should be good for over 500 without restriction. as far as the collector goes i'm just gonna expand it with the pipe expander and connect it right up to the 4". 2-2.5"pipes are a pretty good match for a single 4" pipe. if i wanted to get even more knit picky i think a 3.5" would be even more equal to the 2.5" y-pipe.

BlackScreaminMachine

iTrader: (17)

Yup thats what I have seen, most other companies go 3". I would think there would be a clearance issue for anything over the axle hump.

Order 66

A 4" system does give the flow. But the 4" muffler mufflex uses is not the highest flowing.

BlueThunder2

iTrader: (3)

No clearance or flow issues here. My car is making over 650 hp and is capable of running 10.2's in the 1/4.

senicalj4579

iTrader: (41)

what size y-pipe are you using?

Mike00ss

iTrader: (9)

How is the sound of a 4" muffler mufflex system? Deep, loud?

BlueThunder2

iTrader: (3)

3" ORY. Steps up to 4" right after the merge.

orangeapeel

iTrader: (18)

I used a magnaflow when I had one on my SS. I am about to put a 4" on my Nitrous Z28. It is probably going to get the same muffler as well.

BlueThunder2

iTrader: (3)

Sounds like a Big Block at idle. Not too loud, and really deep. When revved, it sounds Bad as Hell, and is extremely loud. I have a small video clip, but can't post it on here, due to it being in avi format.

orangeapeel

iTrader: (18)

It is very deep. If you have a rowdy cam it sounds SOOO good.

Spdmini

Ditto, The fitament is good, just take your time while installing it and it wont rub or knock on the body. I had trouble w/ the y pipe hitting the SFCs, but a lil trimming here and all was great. plus single outlet FTW.

orangeapeel

iTrader: (18)

on the single exit on drivers side.