I am about to have my uppipe and turboback installed. Do you guys recommend using two gaskets for each connection (one new and the other one the used OEM that was on the stock piping)? I really don't want the hassle of a leak. I will have a gutted uppipe and invidia turbo back installed.

 

I used only 1 at each joint (brand new at either end of the U/P and reused all the rest) and sprayed each with some high-temp gasket sealer. No leaks.