22. The true indication of a performance-oriented part is how and where it increases power. Most hop-up parts make increases in a single area (like the low-end or top-end), but HPI’s throttle body and injectors increased horsepower and torque across the entire power band, with a peak gain of about 5 lb-ft of torque. You may notice the dip in the 2,500-rpm range—that can easily be smoothed out with some fine tuning. But Matt’s overall response was that the bike felt more responsive and the throttle was much snappier, making the bike much more fun to ride.