Just had 3.73 gears installed a week ago and two miles from the shop I see smoke and flames coming out the back of my car. The flames went out as soon as I hit the shoulder but a few fire trucks and State Troopers later the car is still waiting for a few more parts to come in. The rear gears were so hot that they welded together. No damage outside the rear end at least. I love this car and can not wait to get it back together. Just ordered a boss manifold last night.