Side skirt modification

[Powerbeast]

Looking for a shop/individual in SoCal available to help modify correctly the M Performance side skirt from an M4 to fit the F80 M3. Thanks in advanced.

[x.shell]

Originally Posted by Powerbeast

Looking for a shop/individual in SoCal available to help modify correctly the M Performance side skirt from an M4 to fit the F80 M3. Thanks in advanced.

If you want to DIY, I documented how much you're supposed to cut. It isn't hard to cut these but the skirts are a bit more brittle than I thought they'd be. So be careful not to flex it too much or the skirt might crack.

Here are the pics of with measurements of the cuts and clearance after installing.

FRONT:






REAR:

[Powerbeast]

Thanks bud.

[GoodtoGo]

Originally Posted by exo-shell

If you want to DIY, I documented how much you're supposed to cut. It isn't hard to cut these but the skirts are a bit more brittle than I thought they'd be. So be careful not to flex it too much or the skirt might crack.

Here are the pics of with measurements of the cuts and clearance after installing.

Were you able to use the factory hole locations and push rivets, or did you need to use self tapping screws?

[x.shell]

Originally Posted by GoodtoGo

Were you able to use the factory hole locations and push rivets, or did you need to use self tapping screws?

I did not use the factory locations. I ended up using those plastic anchor + screws that I purchased from Home Depot. I couldn't get the plastic rivets to hold the skirt.

[manyofobi]

x.shell your solution only involves cutting out the jacking point. Is that correct? Did you remove the rocker panels for fitting the side skirts?

The IND solution looks a little bit different and includes more cutting the side skirts and drill holes for factory hole locations. With which tool did you cut the side skirts?

[x.shell]

Originally Posted by manyofobi

x.shell your solution only involves cutting out the jacking point. Is that correct? Did you remove the rocker panels for fitting the side skirts?

The IND solution looks a little bit different and includes more cutting the side skirts and drill holes for factory hole locations. With which tool did you cut the side skirts?

- Yes, only trimmed the area to clear the jack points.

- I did not remove the rocker panels to install the side skirts.

- IND solution involves cutting the entire side skirt end to end.

- Factory-hole-locations Smactory-hole-locations... You still have to drill into the rocker panel. Once they are mounted, you'll never think about the drilled holes again.

- I used a drill with a very large bit for the corners (prevent cracking), and a coping saw to cut the straights. A dremel will work great too.

[carM3kee]

Thanks for the info. I have one sitting in the garage that i have been delaying to install....this might just push me to do it sooner.

[Mit123]

Does this mean the wheelbase on both cars in the same? There is no need to trim the actual length of the skirts?

[carM3kee]

installed the m4 mperf sideskirt to my m3, it is short by approx. .25 inches.

[x.shell]

Originally Posted by Mit123

Does this mean the wheelbase on both cars in the same? There is no need to trim the actual length of the skirts?

Originally Posted by carM3kee

installed the m4 mperf sideskirt to my m3, it is short by approx. .25 inches.

The fenders are cut differently between the M3/M4. M3 has a 0.3 inch longer mid section to accommodate the extra doors. However, the wheelbase between the M3 and M4 are the same at 110.7 inches.

[623baller]

Originally Posted by x.shell

If you want to DIY, I documented how much you're supposed to cut. It isn't hard to cut these but the skirts are a bit more brittle than I thought they'd be. So be careful not to flex it too much or the skirt might crack.

Here are the pics of with measurements of the cuts and clearance after installing.

FRONT:






REAR:

any reason why rear was cut 10 inch to 19 inch (9 inch gap)　compare to front only ~4.5 inches?

edit: oops never mind, after looking at rear and front jack pictures it made sense lol

[Johnny250]

bumping this old thread but did anyone run into problems when using the OEM rivets?

I'm going to attempt this but wanted to drill into the side skirt and use the provided rivets instead of tapping screws or other misc hardware.

Thanks!

[EezyBeezy]

Originally Posted by Johnny250

bumping this old thread but did anyone run into problems when using the OEM rivets?

I'm going to attempt this but wanted to drill into the side skirt and use the provided rivets instead of tapping screws or other misc hardware.

Thanks!

Yep, I ran into this issue. The provided clips/fasteners I received with my M4 M Performance side skirts from IND were short too grip properly so I got 6mm nylon blind rivets like so.

6mm Nylon Blind Rivets 2.5mm-4.8mm Grip For BMW

[Johnny250]

Originally Posted by EezyBeezy

Yep, I ran into this issue. The provided clips/fasteners I received with my M4 M Performance side skirts from IND were short too grip properly so I got 6mm nylon blind rivets like so.

6mm Nylon Blind Rivets 2.5mm-4.8mm Grip For BMW

glad I asked, thanks for the recommendation!

[EezyBeezy]

Originally Posted by Johnny250

glad I asked, thanks for the recommendation!

No prob!