Originally Posted by Redstang1
Honestly nothing tht is going to be worth the moment you spend. A aftercat xpipe will give you a different sound but not any real horsepower. The only way to make horsepower in these cars are to tune
You can remove the cats which won't "require" a tune but you will have a warning light always on in the dash. Our cars get around 15-20 HP doing this.
Axle backs provide no extra power, better CAI maybe 5HP.
Really a tune is the best thing you can do.