My Turbonetics ST kit just arrived today. Since it using a down pipe and I have headers/hi-flow/Borla exhaust that will not work with it. So what do you guys think the best solution for it? Fabricate a Y-pipe ( how big 3"? ) to work with the Borla? or Sell the Borla/hi-fow and do a custom exhaust? If I do the custom exhaust, is 3" single will be better or 2.5" dual will be better? any advice will be greatly apprecicated. Thanks in advance.