Quote Originally Posted by drb5374 View Post
Turbo'd cars can GREATLY improve with an aftermarket system.

Catalysts drain so much power.....way more than an N/A car.

I wouldn't quite hope for 25hp from a S/S system on the S, but i doubt it's as low as 10hp.
Yes, but we're presumeably talking about a Cat-back SYSTEM ONLY here - no mention of replacement High Flow Cat/Manifold/Downpipe etc, so they're not changing the Catalyst in this instance. I reckon my Playmini SYSTEM was worth about 8-10bhp, and I picked up some more from the Manifold & Sports Cat. I reckon even standard exhaust systems on 'performance' cars are pretty efficient these days, so you're not going to get huge gains as you did in the 'Olden Days'. Anybody remember swapping their 'peashooter' classic Mini exhaust for an LCB manifold and RC 40 system? Nope? Thought not........