Hello, thanks for the post. Nope at the very least need to make a test pipe from the exhaust to your aftermarket exhaust system. A muffler shop shouldnt charge more then $50 for this labor.
I would recommend a Thermal Research R&D exhaust it is a 3" exhaust system, it will be a little loud however the h22 will best perform with a 3" exhaust. I would recommend installing a 3" resonator and installing that at the same time to keep some of the sound down. 2.5" is the minimum 3" is best. -John