Like a Mack truck on mehamphetamines with a 5 inch pipe boltd to the exhaust manifold. I saw the smoke and heard the roar about 30 minutes before I actually saw it. Was at Sacto Raceway, Wednesday closest to my original post. I would think a turbo vehicle with that little resistance on the exhaust would make a lot more power. I imagine it would be a pretty scary ride too, I would take 12's in an NSX over a 4X4 every time. There was a Ford doing 13's too, just as loud