Best power gains for 997.1 C2S w/o SC???
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There's really nothing that you are going to go "wow" from. These cars are pretty much maxed out from the factory. Look at the OEM X51 package - it doesn't amount to much in real world gains.
On my 997.1S I tried a variety of things and in the end went with: Softronic software, X51 Headers, AWE 200 cell cats, and stock mufflers. Sounded great and was quicker as proven out by my TraqMate on the track. I did not want to do anything to the "internals", such as Flywheel and had bad experience with oiled filters, so swore off those.
On my 997.1S I tried a variety of things and in the end went with: Softronic software, X51 Headers, AWE 200 cell cats, and stock mufflers. Sounded great and was quicker as proven out by my TraqMate on the track. I did not want to do anything to the "internals", such as Flywheel and had bad experience with oiled filters, so swore off those.