2.5inc or 3inc system???
 

Hello all just a quick question,
What are the differences in performance (if any) when using a 2.5 or a 3.0 inc exhaust system??? not sure which one to go for?? :confused:

Bigger is better 3incher all the way :lol1:

gots to go with the 3 incher......the 2.5 just doesn't seem to cut it...:lol:

Is the 3inc a lot louder than the 2.5 or is there no diff once its a bigger bore??

The 3inc is mainly used for big BHP...

So if your car is over 350 BHP go for the 3" all the way!!!!

But.... if your not running particularly high power, can you suffer if the bore is too big?

Cookie :confused:

Good question!
anyone?

I was told the difference is in the spool up time of the turbo + differences in BHP or ft-lb....

you trade either way - the bigger bore = bigger bhp while the smaller one = more torque?

Could have got it wrong tho....

Another "I was told"

If you replace standard system with a 3in and esp if you change the induction or fit an uprated panel filter you should really be looking at a remap too - maybe someone will confirm/deny ?

Silly question..

Does anyone know what size bore my 02WRX would have come with as standard?

2.5'' will be better I think IMO, also seen dyno results at xtreme scoobies and tests theyve done with the 2. Three inch is better for bigger power and high speed runs. Apparantly its a common misconception.

I had a blitz 3'' full system and the car actually run seemingly a bit slower on the roads, but high speed motorway the thing was rapid :D once the standard centre and back box was on it is more pokey now.