Does Callaway have something that doesn't void warranty? Don't they have a close relationship to Chevy?
I don't know how true it is, but they state "supplements GM warranty"...they have a 757HP package.
Callaway offers the most comprehensive aftermarket warranty in the industry. Overlapping the factory GM warranty, Callaway covers all Callaway components and GM components that are affected by Callaway components.
GM dealers do not block factory warranty on Callaway Corvettes; they perform maintenance and warranty repairs with support from Callaway Cars.
http://www.callawaycars.com/homepage...away-corvette/