TPiS Y-Pipe for our long tube Corvette headers. An easy way to fit your 86-91 TPiS Corvette headers to your rear exhaust system. The slip flange attaches right to the catalytic converter with no modifications. The 86 model yearCorvette could have either a 4-bolt or slip flange, so take a look at the front of your cat to make sure before you order. If it is a 4-bolt, then use this Y-Pipe. Included are a pair of 3" band clamps.