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Who Does A High Flow Exhaust In 4 Inch Or 90mm

BU5TER

By BU5TER,
in Engines & Forced Induction

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BU5TER Grand Master

BU5TER

Posted
Posted

Hi guys and girls thinking about exhausts lately and decided I may need a higher flowing exhaust any ideas or suggestions would be great

prefer at this point not to get get a off the shelf Jap 90mm as its a bit out of my budget, 2nd hand jap would be fine but maybe hard to find?

Brett

Mik Experienced

Mik

Posted
Posted
Hi guys and girls thinking about exhausts lately and decided I may need a higher flowing exhaust any ideas or suggestions would be great

prefer at this point not to get get a off the shelf Jap 90mm as its a bit out of my budget, 2nd hand jap would be fine but maybe hard to find?

Brett

Brett, an off the shelf jap system will probably be cheaper than a custom made one. Trust do one (TR) from memory, but it's super duper loud (but you wouldn't care about that :) ). It's only mild steel so not too exxy.

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
hahaha thanks Mik

TRUST do an RO...standing for Race Only...its what Stacey's grocery getter has on it....it even has a little section that you can pop out and fit a cat if you please.

Ronin 09 Grand Master

Ronin 09

Posted
Posted
mate whats it like with the silencer in

brett, without on the GTSt it did 109dB

with it in it knocks off a HEAP of dB - I reckon it's around 96dB with it in.

it drones a bit on the freeway without the silencer, but with the silencer in the exhaust is very streetable.

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted (edited)

ive got the twin 2.5" system after the cat, back to 2x 3" mufflers. It runs no cat, just a 3" front.

Its a damn quiet system, and doesnt drone (made out of ms, as well as splitting it helps)

2x2.5" pipes equal about the same area as a single 3 3/4" pipe.

It fixed up my flow dramas behind the rb30det. Even Cubes says its a damn quiet exhaust for what it is.

Edited by Bl4cK32
Beer Baron Grand Master

Beer Baron

Posted
Posted
brett, without on the GTSt it did 109dB

with it in it knocks off a HEAP of dB - I reckon it's around 96dB with it in.

it drones a bit on the freeway without the silencer, but with the silencer in the exhaust is very streetable.

are there any centre muffles/resonators in that system marcus, or just the rear can?

raz0r$harP.UK Grand Master

raz0r$harP.UK

Posted
Posted

HKS have some nutter exhausts.. my brother has an old Hi-Power (?) one on his 32 that is 3.5" straight through to a 6" cannon.

These days their Titanium Racing Muffler uses 102mm diameter piping :)

Mik Experienced

Mik

Posted
Posted
Cat back my dump pipe is fine hahaha that sounds so wrong

With exhausts will say a twin 2 1/2" exhaust flow more then a 4" to me it should as you've got 5" of exhaust flow but Im probably wrong hahaha

Your wrong :P at a guestimate, twin 2.5 inch is about the same flow as a single 3.5 inch pipe. (I could work it out, but too busy) It's all about the surface area. Think about how many 2.5 inch pipes you could fit inside a 5 inch pipe.

That TR is the one I was talking about...very loud though.

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