Originally Posted by sfearl1

I have Berk unresonated test pipes and I love them. Most companies test pipes are comparable in quality and price. In the end, they're just pipes.

Resonated test pipes have a chamber on the pipe to muffle the sound. Unresonated are a straight through design (louder). Here's pics of resonated vs unresonated pipes...





And I still have the CEL on... doesn't bother me much.