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Hayabusa 12" over tail bracket to be used with stock subframe.
Studs are the preferred fastener choice for high performance engines. Unlike a bolt, a stud uses all of the threads in the case, and it doesn't have to be removed during disassembly which adds wear on the case threads. Studs don't twist like bolts when being torqued down, so torque readings are more accurate.
70lb Heavy duty valve springs.
This is the same valve springs used in our 213mph turbo Hayabusa