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Restoration / Re: 1969 Z exhaust and smog systems
« on: June 15, 2013, 09:14:44 PM »I read somewhere the '65-'69 Corvette side-mount system [chambered also] was about a 50 hp hit on a BB.I think I recall JohnZ saying that chambered on a Z28 had about a 7 hp impact compared to the transverse muffler system.
Note: '65-'67 Corvette side pipes were of a similar chambered design. The 68 Corvette did not offer a sidepipe option. The '69 Corvette sidepipe system (single year offer) was not of the same chambered design.