Because I'm a transportation road rider, I run between 3,000 to 5,000 rpms without lugging on a bike specifically modified to produce more low rpm torque.
These are the torque mods I did:
1. Tuneble Exhaust. Running three tuning plates produces the most low rpm torque.
2. FMF MegaBomb Header. The expansion chamber increases exhaust volume to produce the low rpm torque of a long header in the space of a short header.
3. Longer midpipe. I extended the midpipe 10 inches into the muffler making it 25% longer for more low rpm torque. Long Pipe = More Torque
4. Secondary throttle plate delete. Deleting the ECU controlled secondary throttle plate gets rid of that restrictive "dip" you see in the dyno chart above.
5. Primary throttle plate control delete. This disconnects the ECU from controlling the primary throttle plate making the throttle body solely operated by cable.
6. Delete PAIR valve.
7. Smog delete.
All of these mods working together make for a highly responsive engine without needing to "spool it up".