High Flow Cat + Cat Back Exhaust

[G-Money]

atm have a stock cat + 3" cat back. (r32 rb20)

will a high flow cat give me power/response gains or will they be minimal

i do plan to finish my exhaust just doing it bit by bit

[gotRICE?]

I would say the gains would be minimal. But good enough.

The catback itself would have given the biggest gain.

In my experience, i started with the HKS Catback, then put on a de-cat pipe and there was squat all difference.

Basically you wont fell any noticable gain.

[G-Money]

I would say the gains would be minimal. But good enough.

The catback itself would have given the biggest gain.

In my experience, i started with the HKS Catback, then put on a de-cat pipe and there was squat all difference.

Basically you wont fell any noticable gain.

cheers mate

[_Ryan_]

You listen to a Kiwi?

jks, Family is from there, and lived in NZ for a bit.

I'll give you my theory:

You have a hose, Water is flowing from the tap/turbo, exits out the exhuast/end of hose.

You remove finger from the end, flow increases, pressure drops. You remove a bend/kink that is increasing pressue and hampering flow(think cat), resulting in gains. You free up the small fitting(dump pipe) and a heap more water again can flow, and having the larger piping the whole way through allows it out.

On RB's the dump holds them back, compliance cats are tiny(have a look). A cat doesnt flow anywhere near as much as the straight pipes(look up figures), so the more it can flow the better for the whole system. If you didnt notice at this stage from changing, either your cat wasn't overly restrictive(don't know about NZ compliance), or you aren't at a stage where you can notice it.

I personally would do it sooner rather than later, best off to maximise what ever you have, before trying to do more when the weaker links havent been brought up to scratch.

Hope my tired ramblings helped.

-Ryan

[G-Money]

very helpful mate thanx for that

[gotRICE?]

You listen to a Kiwi?

jks, Family is from there, and lived in NZ for a bit.

I'll give you my theory:

You have a hose, Water is flowing from the tap/turbo, exits out the exhuast/end of hose.

You remove finger from the end, flow increases, pressure drops. You remove a bend/kink that is increasing pressue and hampering flow(think cat), resulting in gains. You free up the small fitting(dump pipe) and a heap more water again can flow, and having the larger piping the whole way through allows it out.

On RB's the dump holds them back, compliance cats are tiny(have a look). A cat doesnt flow anywhere near as much as the straight pipes(look up figures), so the more it can flow the better for the whole system. If you didnt notice at this stage from changing, either your cat wasn't overly restrictive(don't know about NZ compliance), or you aren't at a stage where you can notice it.

I personally would do it sooner rather than later, best off to maximise what ever you have, before trying to do more when the weaker links havent been brought up to scratch.

Hope my tired ramblings helped.

-Ryan

Thats not very nice haha.

I guess i didnt notice a difference when i put in my de-cat ( yay for not having emission laws.. yet ) because my Skyline had only done 49,000km, ( now 50,000 ) so it was probly not overly clogged up.

The biggest change i noticed was it gurgled more at idle and the note when driving was a little more pronounced.

Oh, and it spat a few flames when the exhaust was very hot, after long drives etc. After a squirt of boost and gear changes.