Ok, So I bought a ZR-1 and did every mod. I had about 878hp, something like that. I then bought the race mod, and it said it would remove all parts I had installed from the car. I said ok, whatever. Well after installing the race mod I took it back to the tuning shop and it says this part has already been installed, blah blah. But now the ZR-1 with race mod has only 707hp and is slower than it was before the mod. What am I supposed to do? Buy a new stock ZR-1 and do the race mod before doing any tuning mods?