The thing is a PITA to install. Mine would start to rattle every few months. Got rid of it and cut the stock heat shield.
I had the Cobb Heatshield and it broke 3 times. Cobb gave me a replacement but after the 3rd one, I just sold it. You are better off going with a PTP Turbo Blanket. I can rest my hand on my turbo while the car is running without burning my hand. Try that with your cobb heatshield http://cgi.ebay.com/ebaymotors/PTP-...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
Put one on the STI and it didn't even come close to fitting. It had to be bent and parts of it snipped off to make it work....