I am going to buy a exhaust and i would like to know if putting a 3inch exhaust from the 1st flange from the turbo will be better than putting just a rear muffler on.
Thanks in advance
Evoboy

It depends on what type of car you are putting the exhaust onto as to if a 3 inch system right through is the best way to go you may be better going for a smaller diameter system rather than a 3 inch system.

Large is not always best when it comes to exhaust systems!

If you have an STI or a modified car that is running higher boost then you would probaley benefit from the 3 inch system if not then you may well see some quite large losses by fitting a 3 inch system compared to a smaller system.

Darren

The exhaust system needs to be big enough to carry the gases away quickly but not so big such that the gases do not move quickly. So it's a fine balance.

Darren has rightly pointed out that a high boost (ie tuned) car will benefit from a larger downpipe, but a standard car may well lose torque at the expense of power.