No traction issues, I was getting 2.02 on 60 ft times on the 18" wheels and BFG that the Roush came with. My 13.31 & 13.33 ET's was almost a second faster then the two 5-speed S197 GT's I ran that night. Track to track will always very from area to area depending on air and elevation. The Roush had ran a 13.86 best the only other time it had been to the track before mods.
The Racer kit would work fine as long as you have the Diablo/ C&L tune or have it tuned. FYI- I have a Diablo with the C&L tune for your car if your interested.