No muffler will give you the horsepower you want. Only real engine mods along with exhaust mods will give big horsepower. Do a full open intake with a completely custom exhaust and throw in headers while you are at it...this will give good power increases.

warmonger

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black