+1 on Midnight. Since you've got an '09, with just a pipe mod, you'll be alright for awhile. At the least, you'll probably need to do a TPS Reset (See below). But always best for the long run, to remap eventually.
'08+ TPS Reset Procedure:
- Have the Run/Stop button set to Run.
- Turn the ignition key to the On position but do not crank or start the engine.
- Open the throttle fully to the stop and hold it there for one second.
- Close the throttle fully to the stop and hold it there for one second.
- Repeat the throttle open/close procedure a total of three times in succession.
- Turn the ignition key to Off/On