I need an exhaust expert

[OldVetteGuy]

Back to the original subject, Medsker with the VVT the Hemi can make a great deal of vacuum it idle. Don't think that even though your idle is good and you have no misfires there isn't one. Don't use that as assuming no vacuum leak. Running with a vacuum leak can cause all kinds of issues. Since your still under warranty why not just take it in with the performance exhaust problem.

Especially if you had some work done by the dealership that might have caused the problem to begin with this will also protect your warranty and prevent a lean condition from a vacuum leak causing other problems. Just a suggestion!

 

[chrisazm]

I live in a desert environment and wouldn’t swap out the air filter for a cold air intake. More air flow means less filtering which means more dirt in the engine.
Also something no one really talks about the 392 has active noise cancelling that runs through the stereo. There are 4 microphones in the roll bars. This system is designed to reduce the drone of the factory exhaust when in 4 cyl mode.
When replacing factory exhaust with AWE for example the drone sound is worse even if you disable 4 cyl mode because the ANC isn’t adaptive. The stereo pumps out exhaust drone sounds to try to cancel the exhaust noise but it isn’t the same frequency as the aftermarket exhaust. So you need to remove the 4 microphones to turn off the ANC. The exhaust will be louder overall in the cabin but no artificial drone sounds making the drone worse. I didn’t know this until after the fact. so if you install an after market exhaust say goodbye to MDS. Something to be aware of if you’re thinking about switching the exhaust from factory.

 

[Medsker]

Especially if you had some work done by the dealership that might have caused the problem to begin with this will also protect your warranty and prevent a lean condition from a vacuum leak causing other problems. Just a suggestion!

When you install the K&N CAI you have to cut the "Make-Up Air Hose" two inches shorter. I just ordered a new hose ($30) so I can install the stock intake and then I'll take it back to the dealer to see what's up. Unfortunately I'm taking it on vacation tomorrow so nothing is going to happen until I get back next Monday.

Thanks for all the ideas!