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.

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.

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.

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Thanks Adam, dose any one know where in melb I can pick on up and what sort of price?

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?

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 $470

Muzza.

Edited December 12, 200619 yr by Muzza

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 $470

Muzza.

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Any boost related issues now Muzza? Or do you have a stronger accuator?

Edited December 12, 200619 yr by RAP1D

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 $470

Muzza.

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Any boost related issues now Muzza? Or do you have a stronger accuator?

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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.

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 $470

Muzza.

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Hello, If I fit a 4" inch dump pipe , does it sound better, I've got aps phrase 3 kit fitted. thanks