Callaway vette
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Lingenfelter drove the Sledgehammer Vette for the Top speed record of 254.76 Mph. I guess Callaway was a sissy and couldn't handle his own vehicles
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Did'nt call it the Sledgehammer itself, but many call the twin turbo option sold by GM hammer's. GM offered them until the ZR1 came out, so several did get built and the Sledgehammer was built to promote them.