2021 Base Ecoboost
Former NHRA mechanic & back-up driver, mechanical engineer here: Installed this in tandem with a Steeda shifter bracket as preventative remedy for the MT82-D4 in my car, I only drive casual or sporty rarely, and the difference it makes for the whole car's suspension and driveline behavior is AMAZING! This is something that *every* Mustang owner should be doing regardless of intentions. This part will indeed fit in the slightly updated rubber mount voids, just pre-lube the female holes and the male inserts all the way around (slick polyurethane is not enough on its own) and wedge the wing studs in one edge at a time while pulling down on the OEM rubber mount. The entire driveline is now stiffened to resist both torque and vertical forces, so this car now has vastly reduced: 1) driveline clunking & car jerking/lurching from shifts 2) clutch actually feathers and slips like a clutch now, instead of driveline twisting/absorbing/catching it harshly and preventing clean clutch operation 3) Heavily reduced suspension bouncing/harshness going over bumps on the road 4) Improved handling & driving confidence due all around to the fact that the car's suspension is no longer trying to handle a secondary mass (the drivetrain) weighing a few hundred pounds oscillating on its own rhythm.
This can be lauded as a good cookie improvement to your wives/lovers who may want smoother shifts, less jouncing on the road, and to make it easier to drive the car themselves.
I did not drill the holes or slots in the bottom panel, and at the worst there can't even be a 10% increase in NVH. I'd actually say around overall 5% noise increase at neighborhood and surface street speeds (mostly you hear the resonator/exhaust better), less than 5% on the highway, and I'd say harshness is 0% standalone or reduced if you count the suspension/driveline/clutch behavior improvements, and vibration is around 0-5% depending on the circumstances - but only minor vibrations that are inaudible and likely due to the stiffened "unification" of the masses for suspension. I'd recommend trying it first without drilling, to keep the most benefit from #3 and #4 improvements and enjoy a sports car properly... I get the feeling the vibrational horror stories are people who didn't torque the transmission crossbrace/mounts correctly to 45-50 ft-lbs, or they may have even managed to install the crossbrace backwards even.
Dustin from Yuma on 6/13/2022