How funny you say that yesterday I was takin a look at my quad and noticed the left exhaust dry and the right exhaust to be a little moist ,
I wake up and see your post so now it's gots me thinking a lil like damn could that be that but when the bikes runnin it looks like the same amount of smoke is coming out of both sides when first started when warmed up it goes away (the smoke), for the noise idk ..
As for mods I had them ported the first time I bought a new pair of jugs, it's been bored twice since than, I'm at 64.50 right now , coolhead Domes now at 22cc, just had a fresh top and bottom end done, not even 7 hours on motor yet .
I've been watching a couple vids with FMF pipe and I'm sorta noticing the same noise on every bike so maybe I'm paranoid but rather be safe than sorry so I'm gonna be takin my bike back into the shop I'll let you guys know how it goes . Thanks