I have heard of a few cities having "top speed shoot outs." They open a stretch of runway atan airport and let people get out there and see what their vehicles top out at. They are doing this to help keep people from street racing and when you drag race you can't hit your top speed. I have read about a few grand ams supposedly stock with no limiter hitting 130+. The malibu should be around there then seeing theu share the same basic componets and chassis.