Engine Flutter with hard acceleration
I have a 2012 EB with a MBRP cat back exhaust, airaid intake, and custom tunes from MPT. Recently in my never ending pursuit of the right exhaust sound I had a shop chop my MBRP muffler off, and leave the exhaust dumped under the cab with only a resonator in place. Until I did this the truck ran like a champ, now under heavy acceleration from a stop the truck seems to make a fluttering sound from the exhaust and falls on its face until i hit approx 3300 RPM, then it takes off like a rocket ship. Any idea why its suddenly falling on its face? I contacted MPT about adjusting the tune due to the increased exhaust flow and they said it would be a negligible difference and that any adjustment would be unnecessary.
2012 Silver FX4 EcoBoost SCrew
|6.5' Bed | 3.73 Gears | Luxury Pkg | Max Trailer Tow | 2.5" Level | Nitto G2 Tires
| Rigid D2's | D2 backups | 20" LED Bar | Flowmaster | 12" Kicker | Infinity Components | Custom 5* Tunes | FXR Retrofit | Airaid |