Mazdaspeed 3 Mazdaspeed exhaust

[MAZDARacing2007]

paired with the MAzdaspeed CAI, does the Mazdaspeed catback give a noticible gain in Horsepower, ? anyone know?...

also, how loud is the exhaust?, i like the stock Mazdaspeed 3 exhaust, but it is a little too quiet for me


thanks
BRETT H!~