ClutchBurndout-:( Posted September 21, 2010 Share Posted September 21, 2010 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. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/ Share on other sites More sharing options...
-_-StRyDeR-_- Posted September 21, 2010 Share Posted September 21, 2010 (edited) 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-_- Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459532 Share on other sites More sharing options...
TiTAN Posted September 22, 2010 Share Posted September 22, 2010 catback is 3" because i havent gotten around to making a custom 3.5" one yet. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459776 Share on other sites More sharing options...
Marcus89 Posted September 22, 2010 Share Posted September 22, 2010 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 Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459785 Share on other sites More sharing options...
Touge Kyousou Posted September 22, 2010 Share Posted September 22, 2010 3.5 but i wanted 3 for less drone. Not anymore though since i installed a varex (still 3.5). Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459796 Share on other sites More sharing options...
ClutchBurndout-:( Posted September 22, 2010 Author Share Posted September 22, 2010 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... Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459831 Share on other sites More sharing options...
geraus Posted September 22, 2010 Share Posted September 22, 2010 mines 3inch all the way with no muffler, no cat Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459835 Share on other sites More sharing options...
KiwiRS4T Posted September 22, 2010 Share Posted September 22, 2010 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. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459857 Share on other sites More sharing options...
ClutchBurndout-:( Posted September 22, 2010 Author Share Posted September 22, 2010 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 Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459863 Share on other sites More sharing options...
boostn0199 Posted September 22, 2010 Share Posted September 22, 2010 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? Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459874 Share on other sites More sharing options...
ClutchBurndout-:( Posted September 22, 2010 Author Share Posted September 22, 2010 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... Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459888 Share on other sites More sharing options...
WYTSKY Posted September 22, 2010 Share Posted September 22, 2010 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 Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5459966 Share on other sites More sharing options...
SlowSkyline Posted September 22, 2010 Share Posted September 22, 2010 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. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460001 Share on other sites More sharing options...
ClutchBurndout-:( Posted September 22, 2010 Author Share Posted September 22, 2010 is the only way im going to get away from deep notes is by going back down to 3"? Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460002 Share on other sites More sharing options...
wolverine Posted September 22, 2010 Share Posted September 22, 2010 Replace the hotdog with a decent straight through mid muffler. Problem solved. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460009 Share on other sites More sharing options...
ClutchBurndout-:( Posted September 22, 2010 Author Share Posted September 22, 2010 Replace the hotdog with a decent straight through mid muffler. Problem solved. wont that quieten down the system hugely? Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460098 Share on other sites More sharing options...
30three Posted September 22, 2010 Share Posted September 22, 2010 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 Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460111 Share on other sites More sharing options...
wolverine Posted September 22, 2010 Share Posted September 22, 2010 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. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460119 Share on other sites More sharing options...
jarrod83 Posted September 22, 2010 Share Posted September 22, 2010 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 Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460133 Share on other sites More sharing options...
Rolls Posted September 22, 2010 Share Posted September 22, 2010 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. Link to comment https://www.sau.com.au/forums/topic/337753-what-size-is-your-cat-back-exhaust/#findComment-5460163 Share on other sites More sharing options...
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