-98-Z28-Darkness-

iTrader: (7)

i have been changing my mind for the longest time on doing a 4" exhaust or not.

im planing on getting LTs in probably early next year but also wondering if its worth the extra cash to get a custom 4" y-pipe done with 4" i pipe over the axle and 4" muffler with a dump

how much more HP gains will i get over just headers and 3inch y to the stock 2.75" ipipe?

mods on the car is just ls6 intake and lid stock 2.75 i pipe also, so I'm thinking it may not make much difference for my setup since i don't have too much power going trough it also wondering if it will sound good too? planing on using a 4''hooker muffler or magnaflow
thanks

CLRD4TO

iTrader: (4)

Absolutely not. Waste of time and money for now. One of the muffler brands has a chart with estimated hp to size pipe needed, IIRC, 4" is up in the 600-700 hp range. Plus it will sound like ***, really whispy like.

hitmanws6

iTrader: (20)

it will help a little because of the larger diameter and design. but will it be enough to justify the cost, hard to say

Intercooler2

iTrader: (24)

I like mine although you don't need it all the way out. From the Y back to the axle and a cutout. Good to go! And in sig is a video... sounds amazing through the factory WS-6 muffler

blk99sleekbeak

iTrader: (2)

I am doing a 3" y pipe into a 3" in/4" out flowmaster merge collector with a dynatec splitflow race muffler right off the merge and dumped.I am also doing a cam and a 150 shot next month.Alot of people say a y pipe cant flow as good as true duals but i think my set up will be pretty darn close.I just mainly wanted to try something new

camz28arro

iTrader: (12)

On a stock to 425rwhp car 3 inches is plenty. 90% of the hp gain would be from going 2.75 to 3 inch. After 3 inch it's just very small gains for said hp, has clearance issues, and possibly sounds worse. Just make sure the muffler flows good.

ws6pont

iTrader: (2)

There has been a few threads on here about the gains or not. I have hooker lt's and the Mufflex 4". Does not sound real raspy unless you are on it. Definatley won't sound like many others around. Every one I have met really likes it, it's different.

merlinn

iTrader: (8)

Not worth the cost.

matt3383

iTrader: (3)

IMO if your getting long tubes put on... find a 3 inch y-pipe with a decent merger on it. Run some 3 inch back to just under the passenger seat and put a cutout there. Then you can do whatever you want over the axle. But like everyone else said 3 inch is going to be more than adequate for you car.

sscamaroburn02

iTrader: (14)

4 inches is overkill IMO. will it even fit with clearance my 3 inch x pipe takes up alot of room.

Ryne @ CMS

iTrader: (10)

although it wouldnt hurt you in power, it wouldnt help you much either, but if your looking for a system you can grow into then it maybe a system to look into

CrimeSScene

iTrader: (9)

I just put on the mufflex 4" with the 4" Flowmaster Race Muffler a month ago (I know...I know... flowmaster's don't flow well, but at 4" I don't think that the fact that it's a flowmaster really matters on a cam and bolt on only car.) It really wasn't hard to fit at all. It was actually no harder to work with than the borla catback I took off and goes much higher over the axle. It is LOUD as hell and a bit raspy at times. Doesn't have the nice flowmaster tone I was hoping it would, but I have had a couple of compliments on it, so it must not sound too bad. Overkill...Yes...Big time. I did it because they didn't have the 3.5" I wanted in stock when I went to order it and figured what the hell. No real regrets yet.
I will say, if you go with the Mufflex system, prepare to weld at the connections, because the clamps do not clamp anywhere tight enough to hold the pipes still. I had to weld at every connection just to keep the pipes from coming apart.

NemeSS

iTrader: (127)

unless u have some stout turbo engine, dont see the need for a 4in exhaust tract on a n/a street car.

99bowtieZ

True duals.

tribaltalon

i have hooker super comps to a 4 inch flowmaster y, 4 inch all the way back to a 4 inch bullet muffler dumped behind the back axle. Its LOUD. really not raspy at all, surprisingly, i dont have a whole lot of mods, just intake, cam, etc. on the spray i'm around 500-550ish hp. i've been considering downsizing to a 3 inch exhaust and running an electric cutout just so its not so ******* loud all the time. my exhaust doesnt hang down far at all though, its actually tucked alot better then most exhaust systems i've seen. i may just put a resonator in the i-pipe to see if that quiets it down just a little bit.