Ok, here is goes, I had a 1987 Iroc, with the 5.0 and a 5 speed, my car was done by SLP, so it was better then a stock Iroc, so I dont know, but I would walk the dog on 5.0 mustangs all the time, eat the 5.7 liter irocs for lunch, I installed headers, and a even bigger y-pipe and took the cat off, and ran a 3 inch flowmaster, and with slicks on the car, I would run 13.10s in the quater mile..with street tires, I never could leave the line hard otherwise I would spin the tires threw 2nd and chirping them in 3rd..I never installed sub frame conectors on the car, and I ended up cracking the body above the windows, on the b pillars..the main problem I had with this car, is well I needed a endless supply of trannys..I went threw 7 tannys in a 1 1/2 years I owned the car..