Installed their standard ex. this week and I must let everyone out there know this is by far one of the best exhaust systems out there BAR NONE. The craftmanship is amazing, the welds are perfect, the hangers are perfectly lined up with the factory position, the 02 eliminator is beautiful, both 02 sensors are in place (no check eng. lt) a high flow cat included, and an awesome sound on the throttle, but barely over stock sound at idle, and I have 272 cams and the car sounds wicked over 5k rpm. Guys trust me you definitely get what you pay for with this exhaust, a work of art for sure, no crooked, slanted nasty looking muffler, from the rear it looks just like the stock tailpipe, and its not the overbearing too loud "come on and pull me over officer" fart can sound... Guys it may seem expensive, but think about it : 1)o2 eliminator, 2)hi-flow cat, 3)fully polished 3" mandrel bent full turboback 4)perfect block spacers for lower braces, not some bogus washers 5)all gaskets,nuts,bolts. THIS SYSTEM ROCKS