Hey kingpin, save yourself the head ache and shop around cause they are kits on the market to make the MKV have quad tips. Check the latest Euro Tuner magazine I saw an ad for a bolt on kit. I love custom work but going with a Y pipe you may lose hp and torque rather than gain. I believe GHL has an application.kingpin said:Would it be possible to put a Y pipe into my on my stock exhaust, and turn it into a quad exhaust just by adding another two headed tip? If this was possible, would there be pieces available to improve the sound of the exhaust?