I figured I would chime in on this as I actually ran their resonated test pipes on my G37 for a little bit as part of their test program. They fit up just fine, pulled my OEM cats off and popped those right on without issue.
With my stock G exhaust it was slightly louder at idle and cruising, but when you got in to throttle it definitely woke up and actually sounded pretty cool. At low RPM/high load situations it would have a bit of a rasp at around 2300rpm iirc, but it wasnt terrible, and I would assume most other test pipes or resonated test pipes would have similar qualities.
Material quality/weld quality was decent, nothing incredible, but a good value for the money from what I could see and there were no glaring issues.
I ran the Y pipe as well and that fit up just fine, quality was good on that also, it had some nice reinforced flex sections on each runner and then a nice reinforcement plate on the bottom with a little bend up at the front, I would assume to stop it from catching on stuff on lowered cars which I thought was pretty cool.
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