A new 1st time owner of a 04 RC...I have been reading allot on here about diff mods..1st what is a PAIR delete? A slow rev delete? And how can I tell if its already has been done? Also the flapper mod that controls air flow? I know its in the snorkle but how can I tell if thats done? My 04 has allot of upgrades so I'm thinking probably these have been done..Is there any other things to address to open this thing up more? I'm sure there is...I have Soto Ti high mounts, Soto rear sets, Scott Damp, Pazzo levers, I think PC3...Thanks and love this site and love this RC...Yeh!