Catless will trigger the check engine light, add raspiness to the exhaust, and create a fuel smell.
The catted downpipe will fix these issues
That said its a personal preference; if you dont care about these issues, I recommend you check out the MAD downpipe, it's a better value than VRSF
im more baffled by their choice of profile picture o_O
OP,
lots of good vendors on this forum including us that you can buy from without worrying about being scammed