Catback Exhaust Question

[JDLKizzy]

Thinking about installing the catback at some point (maybe) but was wondering if it is necessary or recommended to re-tune the vehilce after it's installed? I'm assuing there would be a change in backpressure and therefore could affect MPG? Any thoughts and or experiences?

[ROCK]

No retune is need just for that. However the piggy, intake, pulley and catback will complement each other nicely. I know it sounds like an upsell but it is true! Thanks

ROAD/RACE

[CCS77]

What kind of HP gain can be had from installing the Cat back exaust after doing the piggy and SRI mod?

I don't want my car to sound all japped out unless it really picks up the engine.

[kegard]

I'm skeptical how much a cat-back exhaust would really do. Unless you are replacing the stock cat with a high-flow version, wider-diameter pipes won't do anything since our cars are hardly experiencing any back-flow problems.

Please correct me if i'm wrong, or if the cat-back exhaust corrects any deficiencies in the stock system.