I have the Megan test pipes on my 370 for about 2 months now. Bought them used from a buddy who had them ob his car for a while. Quality looked fine to me. Each flange was milled flat, no warps or waves to them. Bolted up to my headers with no problems at all. I do get a CEL with them, so you may need to get O2 bung extenders if you're concerned about the light. You get a "hiss" sound and a little crackle when you let off the gas, like most test pipes. Its an 18" piece of stainless steel pipe, how different can one be to the next unless you're looking at resonated pipes, or ART pipes. I have no complaints.
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