F82 BMW M4 Polyeurethane Lip Mounting Help

Hi all,

I currently have a 2016 F82 BMW M4 and I'd like to mount this polyeurethane lip.

Right now here are my current aero mods:

1. GTS shaped Carbon Fiber Rear Wing. It is mounted higher than the stock M4 GTS Factory Rear Wing. The mount isn't a great mount so it moves laterally at higher speeds. There is a mounting solution available (so the wing stays rigid) but it's around 600 USD so I'd like to see if I can come up with a custom solution but that's something I'll be working on later.

2. Carbon fiber GTS-style hood

3. F82 M4 GT4-style Carbon Fiber Canards

4. Side Skirts (These side skirts look like a straight line and are not curved or sticking up in any way)

5. Carbon Fiber Diffuser (Likely cosmetic and does very little)

My previous lip: (I bought the car with this original carbon fiber lip). This lip broke.

Some observations: Before when the car had the original carbon fiber lip, it had more oversteery tendencies (I prefer a slightly oversteery car) with the stock competition package wheel/tire setup (285/30/20 in the rear + 265/30/20 in the front Michelin PS4S) + stock suspension/alignment. When the lip broke, the car was noticeably understeery (probably due to the aero balance being upset). I have switched to a square setup now (275/35/18 all round Federal 595 RS PRO ... a cheap 200TW tire). The car is still a little understeery though less so now.

My thought process behind going with this lip:

1. It is cheap, looks good, and carbon breaks

2. It is aggressive, but not too aggressive. Ideally, I would go for a GT4 style front lip but those are expensive and I feel that it would upset the aero balance of the car. My guess is that the GTS shaped wing is mounted a little higher (level with the roofline of the car) so it would produce slightly more downforce than the factory GTS wing. Therefore, a GT4 lip/splitter would be overkill. I think the factory GTS lip (and replicas) are not that aesthetically pleasing and very expensive.

Why I think this new Polyeurethane Lip produces a small amount of downforce: I bought this lip and mounted it (with the screws which came in the box). I was driving at around 105 mph (170 kmph) and the lip simply got pulled underneath the car. I think the shape looks like it creates downforce and it seemed to get pulled aggressively underneath the car so I guess that is a signal that it may have been creating downforce. I would guess that if it was producing lift, it wouldn't get pulled aggressively downward, and may actually fly off over the windshield of the car.

My question: How should I mount this lip. I am thinking about using 2 or 3 screws (with nuts) on the left side and 2 or 3 screws (with nuts) on the right side of the lip in addition to the screws that come from the box. I'll also use doublesided tape but I suspect that will do very little to secure the lip. Do you guys think this is a legitimate way to mount it/have some tips? I do plan on driving this car at high speeds (250kmph) and I would hate for the lip to fall off.