YPURV4 KILL,KILL,KILL,DIE,DIE,DIE, Member 2,813 Member For: 18y 9m 6d Gender: Male Posted 11/12/06 10:27 AM Share Posted 11/12/06 10:27 AM Hey people just wondering if I can put a 4 inch dump pipe on to my 3inch exhaust system, would I just have to change the cat so its got a 4 inch flange then out the other side a 3 inch?I know every one is going to say change the 3 inch as I have gone backwards, but I just want to know if it can be done because I want better spool.Thanks.Michael. Link to comment Share on other sites More sharing options...
Adam Here since the start... Lifetime Members 10,282 Member For: 21y 9m 15d Gender: Male Location: Victoria Posted 11/12/06 10:34 AM Share Posted 11/12/06 10:34 AM It can be done easily on a 3" single system. I have a SMB cat and dump pipe with an adaptor from 4" done to fit the stock exhausts 2 x 2.25" system. Link to comment Share on other sites More sharing options...
YPURV4 KILL,KILL,KILL,DIE,DIE,DIE, Member 2,813 Member For: 18y 9m 6d Gender: Male Posted 11/12/06 10:38 AM Author Share Posted 11/12/06 10:38 AM It can be done easily on a 3" single system. I have a SMB cat and dump pipe with an adaptor from 4" done to fit the stock exhausts 2 x 2.25" system.←Thanks Adam, dose any one know where in melb I can pick on up and what sort of price? Link to comment Share on other sites More sharing options...
bugster70 Donating Members 1,326 Member For: 19y 9m 7d Location: Canberra Posted 11/12/06 11:12 PM Share Posted 11/12/06 11:12 PM Adam, I guess it'd be hard to determine how much of a difference the larger dump made separate from the cat (I assume it was all done at the same time), but what were your reasons for fitting a larger dump if you were retaining the rest of the stock system?I mean, most guys keeping the stock zorst just opt to change the cat. Do you think you reaped worthwhile benefits by doing the dump too? Link to comment Share on other sites More sharing options...
Muzza No V6 for me thanks!! Donating Members 583 Member For: 19y 6m 4d Location: Newcastle Posted 12/12/06 07:25 AM Share Posted 12/12/06 07:25 AM (edited) I have a 4" Dump that goes onto a APS exhaust.It's the xforce dump & when I ordered it ,a option was either 4" out or 3.5". 3.5 fitted up nice to the cat.Nick was carrying Xforce stuff. around $470Muzza. Edited 12/12/06 07:26 AM by Muzza Link to comment Share on other sites More sharing options...
RAP1D Member Donating Members 3,739 Member For: 18y 8m 21d Gender: Male Location: Sydney NSW Posted 12/12/06 09:23 AM Share Posted 12/12/06 09:23 AM (edited) I have a 4" Dump that goes onto a APS exhaust.It's the xforce dump & when I ordered it ,a option was either 4" out or 3.5". 3.5 fitted up nice to the cat.Nick was carrying Xforce stuff. around $470Muzza.←Any boost related issues now Muzza? Or do you have a stronger accuator? Edited 12/12/06 09:23 AM by RAP1D Link to comment Share on other sites More sharing options...
Muzza No V6 for me thanks!! Donating Members 583 Member For: 19y 6m 4d Location: Newcastle Posted 13/12/06 08:00 AM Share Posted 13/12/06 08:00 AM I have a 4" Dump that goes onto a APS exhaust.It's the xforce dump & when I ordered it ,a option was either 4" out or 3.5". 3.5 fitted up nice to the cat.Nick was carrying Xforce stuff. around $470Muzza.←Any boost related issues now Muzza? Or do you have a stronger accuator?←Had a stronger accuator to start with.Been using a manual boost controler till I get some dyno time to tune. 2 or 3 other things I'm doing so it all can wait till then. Feels stronger now.Muzza. Link to comment Share on other sites More sharing options...
mrturboman Member 29 Member For: 20y 5m 13d Posted 02/01/07 10:19 AM Share Posted 02/01/07 10:19 AM I have a 4" Dump that goes onto a APS exhaust.It's the xforce dump & when I ordered it ,a option was either 4" out or 3.5". 3.5 fitted up nice to the cat.Nick was carrying Xforce stuff. around $470Muzza.←Hello, If I fit a 4" inch dump pipe , does it sound better, I've got aps phrase 3 kit fitted. thanks Link to comment Share on other sites More sharing options...
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