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? - PAIR is part of the redundant exhaust system....basically it is a MOD to remove a portion of it. Helps w/ HP's
A slow rev delete? - I think this is the rev limiter MOD...will take the soft limit from 9200 to 10,200 I believe.
And how can I tell if its already has been done? - Not sure how to tell you to see if it has been done. Now that mine is in, I know what the wire looks like
Also the flapper mod that controls air flow? - Correct Sir, opens and closes at certain rev points. As hot as it get's here, I wanted mine open at all times
I know its in the snorkle but how can I tell if thats done? - Take a flashlight and look up the snout of your RC. If you see a verticle Flapper...then it is still there...if not, one Mod for you to do !
My 04 has allot of upgrades so I'm thinking probably these have been done.- With the list of add-on's you have, I suspect the Flapper and maybe the PAIR has already been done.
2001 SP1 - Code Name F-Bomb - PCIII USB / D&D High Mount System / 42T / EK SRX 530X / CRG Levers / K&N Filters / Stomp Grip / Rev Limiter Mod / Flapper Mod / PAIR Mod / Undertail / Hugger / 6K HID Lights / Speigler lines / Wave Rotors / CF Airbox / Shorai Battery - More to come, as soon as my slush fund get's more "Slushy" !