You can take a stock gsr throttle body and have it bored to 64mm for about $100-$150. I remember a company called Maxbore that was somewhat local and had a decent turnaround time. Try
Honda-Tech.com: Main and searc for maxbore.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.