Speed's has now added another top tuning unit in Thundermax! Speed's now will be selling, installing, and tuning Thundermax. Thundermax is an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson motorcycles. This highly advanced, stand-alone tuning system utilizes proprietary Autotune technology with wide-band oxygen sensors to deliver unmatched performance and rideability. So stop by any of the events Speed's attends or call or email for an appointment today!