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ive got a stock r33 gts-t and looking to get a bit more power + sound, im thinkin a 3.5inch system, sounds a bit overkill but id like to go for 300rwkw down the track.

so im thinking of going for a big hiflow cat over a gutted stock one for legal reasons, so question is wats the diameter of the stock one, and also the dump pipe (which is the one comming from the turbo to the cat right?)

so is it possible to keep the stock dump pipe(reason for this is wen i upgrade my turbo, ill need to change it agen right? if i go for a bigger turbo, something to handle 250-300rwkw) and can i go into a 3.5inch cat with an adaptor or something?

if im not making sence, i want a 3.5inch system, but also save money at the same time, hence the reason i wna keep the stock dump, so i dont have to buy another 1 later on, and i heard cats restrict the rb25 alot and i heard the 3inch highflows are shit, so i wna find a less restrictive one, would a 3.5inch highflow metal cat flow good? if not wat brand/size do u guys recomend for a 3.5inch system

can someone point me in the right direction please, im new to the modification scene.

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https://www.sau.com.au/forums/topic/254962-exhaust/
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ive got a stock r33 gts-t and looking to get a bit more power + sound, im thinkin a 3.5inch system, sounds a bit overkill but id like to go for 300rwkw down the track.

so im thinking of going for a big hiflow cat over a gutted stock one for legal reasons, so question is wats the diameter of the stock one, and also the dump pipe (which is the one comming from the turbo to the cat right?)

so is it possible to keep the stock dump pipe(reason for this is wen i upgrade my turbo, ill need to change it agen right? if i go for a bigger turbo, something to handle 250-300rwkw) and can i go into a 3.5inch cat with an adaptor or something?

if im not making sence, i want a 3.5inch system, but also save money at the same time, hence the reason i wna keep the stock dump, so i dont have to buy another 1 later on, and i heard cats restrict the rb25 alot and i heard the 3inch highflows are shit, so i wna find a less restrictive one, would a 3.5inch highflow metal cat flow good? if not wat brand/size do u guys recomend for a 3.5inch system

can someone point me in the right direction please, im new to the modification scene.

For starters, anything under 350rwkw and a 3inch system is capable of performing well. If you go for a 3.5inch system it will cost you 30% more for no gain whatsoever (except for the extra loud exhaust note).

You can change the cat back system to whatever you like then just bolt on the larger catalytic converter and front section later if you like. If you get something custom made for a dump pipe, it can easily be chopped later if it has to be and would only be around $100 to change it to suit the new turbo.

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