Things I changed on my P5: RX8 wheels 215/35/18 Falkens, Kenwood BT Media HU, Apline power pak for Polk Audio comps F/R doors, Kicker 500W Mono amp paired with 12" Kicker Comp Sub enclosure, Eiback Pro-kit springs, Injen coldair intake, LED interior lights, LED rear plate lights, HL retro-fit Morimoto H1 ver5 HID projectors 6k bulbs, Honda S2000 antenna and removed roof rack and installed covers. Bought the car new 09/2001, auto trans with moonroof. Also had to get a new motor early last month...water pump seized 4 years ago and happened again in 08/2012, my mech said that the motor is no longer good since it got damaged a bit the first time the water pump seized. Forgot to mention...upgraded to Mazda 6 hatchback rear window wiper; painted brakes calipers RED; slotted and drilled F/R rotors and mazdaspeed rear exhaust....
Since I just replaced my motor....want to add more HP but not adding a turbo kit and not doing anything with my new OEM motor....any suggestions out there?
Thinking in the line of the exhaust system from manifold/catback pipe(s) area....is it really worth changing it to aftermarket and still keep my MSP muffler?