hey dawg....here are my .02 centavo's and I am sure someone will correct me if I am wrong
If they are just slip on's, I do not think you will notice much of a change performance wise. But, if you move to a full Lady Bird system, then I would suggest a PC3 and get a map that is close to that system, or take it and have a custom map done. There are a few guys here that have Ladybirds so i would bet they would be happy to help you out with a map or 2 !
Hope that helps !!
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" !