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I took the car in yesterday to have my Kooks 1 7/8" headers and catted X pipe installed and have the car tuned. I left the rear NPP exhaust alone. Only other mod is a AFE intake. Impressed w/ the final figures, the car pulls so much harder and smoother.
I am not a math guru so I am sure someone on here can set the record straight for calculating dyno and driveline loss. I always divided the wheel hp or tq by .83% assuming 17% for loss. The shop says they multiply the # by 1.23 since their dyno has parasitic loss in its design. So not sure which way to go. If I take my baseline hp #(382) w/ the CAI installed x 1.23 we get 470 which would make sense for this engine w/ a CAI. Temps were about 95 degrees in the shop.
Anyway here is the dyno sheet, wheel hp jumped 65 and tq 64. That is before we try to calculate figures to the crank. Very happy w/ the results either way. Some on here said one could only pick up 20-30 hp w/ headers and a tune but this shop has a great reputation for tunes and did wonders on my C6 and they said I would get close to 70 on the C7.
Dyno results, header and X pipe install
