Hey you have marthy's underbelly exhaust and flashed ECU right? Do you still have your O2 censor connected. With the reflash do you still need your O2 sensor? Currently i have the O2 Optimizer that came with my PCV connected. If i remove the PCV and Optimizer and reflash my ECU would it cause any problem since we know the ECU needs input from the O2 sensor. Since our mods deviate greatly from the norm it feels like I should take a trip to Guhl and have then dyno the bike and do a custom tune to account for the shorten/catless exhaust, shorty can, cut airbox and KN filter. What do you think do custom tune/fuel map be justifiable or the standard one Guhl use will be fine.