thats a great price, the only drawback is the lack of warranty since you are not the original owner. but to be honest for $300 i'd take my chances and get it
You can get the Fabspeed 200 CEL HJS downpipe, but its even more expensive.
leen in mind the Gesi cats used in the Active Autowerke downpipe are rated at 950 HP, so if you are not even close to that power level, there is no downside to going with them
GESI is not 200 CEL, its 400 CEL
the flash tune hides the code, you will still fail emission testing so if thats a thing in your state, the GESI cat is worth the investment since its EPA approved