Suzuki MZ250 2009-2014 New Twinair Iboost throttle body power flow kit insert

NEW TWINAIR IBOOST POWER FLOW THROTTLE BODY INSERT. For better top-end throttle response (90-100% open throttle position), use the kit’s larger butterfly valve without the sleeve. Add the thinner butterfly valve and less obstructive shaft, and you’ve got faster, more even throttle response through low- and mid-range.

eBay