I have researched this a lot and kudos go to peeps who posted their experience with H&R M5 F90 dedicates springs and some had to swap to M550Xi which is a painful process and because of you guys I was able to avert this and I owe you a big THANK YOU, and I owe you money and time!
And to pay this forum back I decided to post the pics post install &
My humble impressions (Early on, will update in a few days) and FWIW
1. Certainly handles better like 10-20% = Less Body Roll no doubt
2. Low enough and I was told by installer it will sit a little lower with time too and the shop was all over it and took pictures for their INSTAGARM (Shout out to local EuroMpire, Monroe NC and Matt the owner)
3. Cosmetically looks right and amazing and I wouldn't even go lower! For 300$ plus install about 1000$ total BTWay!
4. Stiffer? Maybe but if it makes any sense in a smooth way, so less forgiving when it gets bumpy but on smooth roads can't tell difference, I think matches what I heard about M5C
Enjoy The M550Xi Sport Springs show