What Size Is Your Cat-back Exhaust?

[ClutchBurndout-:(]

Im just curious what everyone's exhaust system is, this is for R33 gtst only, and just the cat-back size, not the dump/front or cat.

ive only done it up to 3.5" because im referring to street cars, not trackies.

[-_-StRyDeR-_-]

I know its not a r33 but, i had a HKS super dragger cat back on my rb20det and it was sooo quiet, loved it, however its now on my 25-30combo and nothing i do can shut it up hahaha

oh and i think its over 4" tip... but about 10 barrel

Edited September 21, 2010 by -_-StRyDeR-_-

[TiTAN]

catback is 3" because i havent gotten around to making a custom 3.5" one yet.

[Marcus89]

I didn't vote cause you said r33's only but i have a 3.5" catback on my r34 which is pretty quiet much quieter than mates cars when i am driving with them i likey

[Touge Kyousou]

3.5 but i wanted 3 for less drone.

Not anymore though since i installed a varex (still 3.5).

[ClutchBurndout-:(]

is there any benafit of having a 3.5inch system when your pulling about 170rwkw? i have the 3.5 and i hate my exhaust note...

[geraus]

mines 3inch all the way with no muffler, no cat

[KiwiRS4T]

is there any benafit of having a 3.5inch system when your pulling about 170rwkw? i have the 3.5 and i hate my exhaust note...

Keep the 3.5 change the rear muffler.

[ClutchBurndout-:(]

Keep the 3.5 change the rear muffler.

ive changed it,

A you cant get 3.5" ovel mufflers

B 3.5" inlet cannons are hard to find that dont have the 4.5" tip (which is the part that makes it drone)

i have the xforce 3.5 in, 4.5 out, and its deep and shitty sounding

[boostn0199]

is there any benafit of having a 3.5inch system when your pulling about 170rwkw? i have the 3.5 and i hate my exhaust note...

at 170kw a 3ich or 3.5 wont make a difference, what type of exhuast is it reasoanator in middle with a cannon or oval muffler at the rear?

[ClutchBurndout-:(]

at 170kw a 3ich or 3.5 wont make a difference, what type of exhuast is it reasoanator in middle with a cannon or oval muffler at the rear?

it has a hotdog in the middle and cannon on the back, thinking of taking the hotdog out...

[WYTSKY]

Ive tried to measure mine but with a few dints and knocks in it its hard to tell.. somewhere between 3 - 3.5inch

+ a 2ish inch screamer

[SlowSkyline]

ive changed it,

A you cant get 3.5" ovel mufflers

B 3.5" inlet cannons are hard to find that dont have the 4.5" tip (which is the part that makes it drone)

i have the xforce 3.5 in, 4.5 out, and its deep and shitty sounding

You can get 3.5" oval mufflers, i have a 4" in/out oval muffler, very deep note.

magnaflow make them in their race series range. All stainless, exy but.

[ClutchBurndout-:(]

is the only way im going to get away from deep notes is by going back down to 3"?

[wolverine]

Replace the hotdog with a decent straight through mid muffler. Problem solved.

[ClutchBurndout-:(]

Replace the hotdog with a decent straight through mid muffler. Problem solved.

wont that quieten down the system hugely?

[30three]

I have a 3.5 Kakimoto with no mid muffler and an oval muffler. I think it goes to 3.75 or 4 from the diff back though. I think it sounds pretty good

[wolverine]

wont that quieten down the system hugely?

I thought you were complaining about the drone? It will be quieter but a 3.5" system with a mid muffler of modest size and reduce the drone.

[jarrod83]

there is other ways to fix the note.. i had a 3.5 inch dump/cat, to a 3 inch hks exhaust that megaphoned out to 90mm just before the muffler, it sounded lovely with a 3inch dump but had a horrible drone with the 3.5 inch. replaced it with a dual 3.5" xforce muffler with a section rewelded so it was full 3.5", it is very quiet and no drone, a touch louder than a stock exhaust.. the only problem im having is because of the second oval muffler is where the resonator would usually sit, it does sit a bit closer to the ground

Jarrod

[Rolls]

ive changed it,

A you cant get 3.5" ovel mufflers

B 3.5" inlet cannons are hard to find that dont have the 4.5" tip (which is the part that makes it drone)

i have the xforce 3.5 in, 4.5 out, and its deep and shitty sounding

The tip has nothing to do with the drone, it is due to the muffler size construction and number used, if you have a 3.5 system with a single straight through muffler im not surprised it drones, your best bet is to get another inline oval 3.5" straight through muffler and put it in the middle of the exhaust, should quieten it down quite a bit removing the drone and bass.

I had 2 straight through 3" mufflers on a 3" system and it was almost as quiet as stock, removed one and it has a very nice note now, not too loud and droney but not too quiet either. 3->3.5 is a reasonable size increase so I think you will find 2 mufflers will make it sound a lot nicer, most workshops will change it out for a plain resonator if you find it is too quite for not much more money.