jeffrec

I own a 2009 C2S 3.8L, manual shift. I've owned the car for 5 years and really enjoy taking her out on weekends on the open country roads north of Atlanta. To date the only performance mod, if you can call it that, I have made is a Sharkwerks center muffler delete. I really enjoy the GT aspects of the car and am looking for any means of adding a few more HP. Forgetting the ECU flash for a second, are there any other mods I could undertake? Tuned exhaust for example perhaps. I've heard that a cold air intake really doesn't make much difference given the stock air box. Any recommendations aside from trading her in for a GTS or Turbo?

Thanks in advance!!!!

nwGTS

Search the 997 forum and you'll find a lot of advice.
Front end breathing: IPD Plenum and GT3 TB along with performance filters in the standard airbox.
Back end breathing: Headers/cats, side cans, center delete

These are all bolt on. Personally, I'd start with the performance filters, IPD plenum and GT3 TB.

BF951

I found an EVOMS intake and IPD Plenum to make a noticeable difference. I couldn't be happier with them. These are amazingly easy to install and thankfully there are not a dozen different flavors of each.

Not true for the exhaust side but I think any vendor's sport cats will allow improved exhaust flow and breathing. Keep in mind quality of built whether others have had fitment issues or Check Engine Lights with any particular piece.