Bought the "cheapest" - straight pipes with beautiful tips. Sound great - pretty easy installation. 1 problem: The Insulator mount (keeping vibrations from the body) has 2 bolts connected with a rubber/neoprene cushioning connector that could not handle the stress/torque from actual track time. I was "black flagged" because my one connector broke out and my tail pipe was dragging. I did a home repair - hockey puck and "all-thread" rods kept it all together.