maybe for club racers, but way more of the AMA/moto-america guys use aftermarket aluminum ones. when i worked for vesrah suzuki & my rider jake lewis won the 2012 east coast supersport championship our bikes used different subframes & our sharkskins body work could use a variety of mounting positions & we used the non-OEM positions on the new subframe. We used aftermarket sub frames on eslicks triumph in 2014 & on both our riders aprilias in 2015.98% of the guys racing gsxrs including us, run OEM sub frames. They are multi pieced and finding used straight ones is cheap after a crash. No real gain getting an aluminum one but you could I guess. Make sure the tabs are in the OEM locations so a race tail will bolt up cleanly. But race wise, I'd shed weight in other areas. Pm me for details, been setting up gsxrs for racing for some time now and know some nice tricks.
maybe for club racers, but way more of the AMA/moto-america guys use aftermarket aluminum ones. when i worked for vesrah suzuki & my rider jake lewis won the 2012 east coast supersport championship our bikes used different subframes & our sharkskins body work could use a variety of mounting positions & we used the non-OEM positions on the new subframe. We used aftermarket sub frames on eslicks triumph in 2014 & on both our riders aprilias in 2015.
OP..... theres several over the counter options for you out there, refine your search techniques & try again. heres a couple links to get you started.
http://www.r-r-racing.com/1/subframes.htm
http://www.ukroadandrace.co.uk/epag...00GSXR750_RACE_FAIRING_BRACKETS_AND_SUBFRAMES