I just have a theory question here. 2015 GROM I bought an exhaust system off eBay so I could play around with it. I cut the pipe open and removed the honeycomb like inserted material used as a catalytic converter and had it rewelded. It looks stock. There are no sensors on the pipe, there is what I think is an O2 sensor but it is on the head. Will this pipe actually increase performance or is it really nothing.