Prior Experience:
I had the same experience as Ervic, as I started off with UP Moderates and switched over to the MPP Comfort Coils. My intention was to reduce the wheel gap and gain some improved handling, but there were some shortcomings with just installing springs w/o shocks. Based on my experiences in the tuner scene (years ago) I never had positive experiences with just swapping springs, as they were just too bumpy and often times bottom out on the bump stops. Fast forward to my Model 3, I had a gut feeling to go with MPP coils, but figured I could save some extra cash and put that into new wheels and get PPF done. Boy was I wrong.
Upon installing the springs and driving with them 120 miles a day, dealing with large bumps and high-frequency splits/cracks on the freeway became annoying. On smooth roads the springs felt great, but when dealing with bumps, the rear of the car tended to oscillate up and down and not settle quickly. I'm assuming this was due to lack of dampening of the OEM shocks paired with the lowering springs.
In terms of taking high speed curves (i.e. on/off ramps), I did not feel as confident taking them with the new springs. I can't really describe the feeling, but I felt the rear was a bit wobbly/un-settled. The stock suspension just felt tight and controlled going into the turn even if there was a bit more body-roll. On top of all that, I also experienced other issues as some others have mentioned:
1. Front springs making a boing sounds when turning at low speeds.
2. Click/tapping sound coming from rear springs when hitting bumps.
3. Additional creaks and rattles coming from inside the cabin.
MPP Comfort Coil Experience:
With all of the above issues, I decided to bite the bullet and make the order for the MPP Comfort Coils and Rear Arms (camber and toe). After spending a few hours on installing them myself in the garage, I immediately noticed a huge difference just pulling out into the driveway and onto the road. All taps/clicks were gone and no more noises from the front springs. My neighborhood has speed bumps at every block and the MP coils handled them with ease. High speed turns felt similar to OEM (sporty and tight) and freeway commuting was finally comfortable again. I have not yet experienced any bottoming out on any large bumps or poles. Overall, I would say they perform very close to stock and maybe a tad more comfortable.
If you daily drive your Model 3 and want the lowered look without any sacrifices, the MP Comfort Coils are a must. Lowering is a modification to not cheap out on to save money, especially since we bought Model 3s. Do it right the first time and get the proper setup. Hope this helps some of you make the right decision if you're planning to make this modification.
Other Info:
Vehicle: Model 3 RWD LR
Wheels: Vorsteiner VFF-103 20" Staggered
Installer: DIY (feel free to DM if you have questions with install)
Alignment Shop: California Wheels in Campbell, CA
Daily Commute Miles: 120. Mostly on 680 and 280 in the San Francisco Bay Area
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