[Blue Flame Restorations]

Originally Posted by Hib Halverson

Exhaust emissions and beating guzzler had nothing to do with the existence of the port throttles. In fact, guzzler was never and issue with the LT5.

The secondary port throttles exist soley to improve low speed torque and throttle response.


Actually, most C6ers with cars having NPP do not "...replace them". Admittely, some folks do swap an aftermarket exhaust for the stock dual-mode system, but more C6 people retain the NPP system but add an device ("Mile2Wild", "Exhaust Commander" and similar products) which allows them to manually control the exhaust bypasses.

Any data to support "most"?