I have read several of the listing for this and still can't decide. Stock well it's stock, but seems to be ok straight, more power, smells and voids warrenty. High flow a little more power voids warrenty possibly.?????

 

It shouldn't void warranty unless your dealership wants to be a dick about it. The rp supercat will pass emissions testing but they are prone to burn out after a while so becareful what you get.