18 completely stock, I noticed my exhaust is getting louder. Everything is tight, no leaks. It just rolled 4,000 miles. It's this normal?? I only recently noticed this, because I have the Sena comms in my helmet, and I have the fm on for music and I usually can't hear the exhaust over it, but today I could hear it over my music with the volume all the way up. I'm not too worried about it I got a voodoo system on it's way And on another note, I plan on getting the Nash flash, but wanted to double check if it would cause any long term damage to ride with the de-cat, and slip ons untill I get there re flash done. I live in SC, so I can ride year round. Planned on January for the reflash because it's usually crappy weather from January to April. I won't be going but maybe a few hundred miles a couple times a month, if it won't hurt it. Could I move the O2 sensor to the left pipes so it picks up the leaner cylinder??