spazio10

hey i have a 5th gen hatch and am interested in working the exhaust on it. i was wondering what diameter pipe and muffler size would allow for perfomance gain but not so much sound (if possible at all) i currently have a CAI and in the midst of purchasing an exhaust mani. i was also thinking of replacing the cat with a test pipe. any input would help, thanx

oh and i have been told that a muffler with at least 3 in of canister insulation around the pipe would give a nice sound that isn't too loud.

imported_Cablerat

type-r exhaust is silent..

imported_egb18c

test pipe = loud & illegal, most people go with 2.25" or 2.5" piping

1c6_eh6_t-si

and looks great...
pointless to run a testpipe unless you're Turbo'd... gains are minimal and you're just stinking up the air

imported_Mashimaro

Apex'i worldsport is nice and quiet. i'm using a header-back full system that's actually 2.5" all the way through (straight pipe).

spazio10

i am going to be doing header back. i was thinking a 4-1 vs the 4-2-1. will that make much of a diff and does the 3" intake help as well? i know right now that the intake gives a nice sound even with stock exhaust

imported_Mashimaro

i'm using a Mugen 4-1 header and i noticed a nice little gain from it over the stock 4-2-1 i had before. as for the intake size, i'm not sure if it'll make a big difference or not unless you have an aftermarket intake manifold, cams, etc. done as well...it may still bottle neck a bit after the 3" piping (throttle body?).

spazio10

yeah that makes sense. what about imitation headers, like the cheap ones you can get off of ebay. are they poorly made, would i be wasting my time and money or is a header a header?

cee_mon

Just get a dynomax super turbo exhaust, dont let the name fool you. It is really quiet and cheap.

imported_egb18c

I recommend the dynomax superturbo too

Dr.K

Just buy a Cheap pipe and get the Longest resonator you can in the Diameter Exhuast your going to. If you go 2.25 inch and get a foot long resonator it will be very quiet. I had a similar set-up on a Focus and it was barely louder than stock. I have a 2.5 inch right now on my B16 and its Very Quiet under 5000RPM. Why?. I have a 2.5 Resonator thats 18" long!!!! . I say buy whatever cheap pipe you don't mind the look of and buy a 2.25 inch resonator and get an Exhuast shop to Weld up a 2.25 inch system for you. It should still be cheaper than buying a full cat-back system and give you noticable gain's with minimal sound increase. The reason some people's car's are stupidly loud is they don't have a resonator.

spazio10

is there even much performance gains from stock diameter to 2.25" or 2.5" if any at all?

Dr.K

yes there is. not much on a stock Motor but it adds up as more mod's are introduced.

imported_Zyepher

Buddy club spec II

Younes Si

i have a resonator as well, but doesin't that sihit decrease your hp gains if any, because you have your headers then your exhaust that have to travel through that your resonator on a smaller pipe then back open to a large pipe and out?

imported_t_dot_SiR

how much is the dynomax superturbo exhaust cost?

i'm using header-back magnaflow... deep and nice (not too loud) outside, and very quiet inside from 0 to 4500 rpm.....

Dr.K

No...Not if your Resonator is the Same internal Diamerter as the rest of your exhuast. You can see right throught the thing. I have a 2.5 cat, 2.5 Resonator into a 2.5 muffler at the back. the muffler is straight through as well. Im suprised myself how quiet it is. Its all in the Resonator.

punkindrublic