2.5" vs. 3" diameter exhaust pipework

[1JZGTE]

hi everybody.

 

if i am to keep a twin turbo standard apart from:

 

1. cold air intake

2. FCD

3. exhaust

4. electronic boost controller

 

...would there be much point in fitting 3" diameter piping?

 

i spoke to two exhaust places today just to get their opinions and both said roughly the same thing: 2.5" pipe is good enough for up to 340bhp. anything over and 3" would be better.

 

bearing in mind that the above mods are as far as i am going to mod it, will a 2.5" (60mm) exhaust be ok or should i really be looking at 3"?

 

[Homer]

There is no need for a 3inch exhaust pipe on a BPU supra, the stock size piping is perfectly adequate.

 

Also, forget cold air intake, they tend to do the opposite

 

Before commenting on the rest, is yours a UK/export spec or JDM model?

[1JZGTE]

Thanks Darryl. Quick q - why would a cold air intake from, say, bottom of front bumper be worse than an HKS mushroom filter which from reading I understand collects loads of sand and other crap?

 

[Homer]

Sorry mate, think I misread your post

 

The best possible intake system for a BPU car is the stock one, so get your hands on one of those and forget the aftermarket tat.