 In 2003, the F4 750 S Evo 03 was released, which was mostly a cosmetic upgrade.The F4 750 SPR was released in 2004 and was intended to be the final evolution on the F4 750 platform, mainly aimed at track use.The engine was uprated from the 750 Senna with higher compression pistons, redesigned inlet and exhaust post, refrofiled combustion chamber and hand polished inlet port.