I have a 91 Mustang that makes around 650hp and I hit it with 175 hp shot of nitrous and the car loves it, it never spins a bit. For suspension I have QA1 adjustable coil overs, QA! adjustables in the back, a rear anti-roll bar, 10 point cage, sub-fram connectors, and adjustable upper and lower control arms, I have reinforced upper and lower torque boxs, and I scaled the car as well. I don't know the extent you have gone to with your car but I am very confident I could throw another 150-175 hp at my car and it would still hook.