[Modshack]

Originally Posted by 16camarors

Yea it sounded dumb to me to.... So they than said the pipe they installed had
Two holes and they re-welded it and it sounded better but that rattling was still there if that makes sense.

Do you have an Automatic? The AFM valves are ahead of the muffler and shouldn't have been removed depending on how intrusive your delete was.
They close to keep the car from sounding like Ass when in cylinder de-activation mode. No Automatic? No valves then. I doubt chevy is gonna help you here as it sounds like a hack install..

All three engines feature direct injection, which enables an increased compression ratio for a greater balance of performance and efficiency. For models equipped with an automatic transmission, the all-new 3.6L V-6 and the new LT1 also employ Active Fuel Management cylinder deactivation technology, which disables some cylinders under light throttle applications to enhance efficiency. In the 3.6L, two cylinders are deactivated and in the LT1 V-8, four cylinders are deactivated.