howardm50

Question is, is the PSE that comes with the x51 package any different than a "non x51" PSE? Same question on the sport chrono features - sport plus and active mounts.

I have both these options on my C4s. I am interested in the x51 engine and ECM mods; but am I paying xtra for these two components of the x51 package that I already have?

chuckbdc

I believe they are the same on a 991S, and you need order only the parts you don't have (heads, cams, intake manifold, center radiator, attendant fittings).

LexVan

Same.

LexVan

See, you can order the PowerKit with ($1,500 more) or without PSE:

http://www.suncoastparts.com/product...=991SENGINEPER