"For the F8x Performance Style front lip I'd give it an 8 out of 10 on fitment only because you do have to drill and you do have to trim some parts. I filed some edges down to fit perfect because I am anal about that stuff. To be fair even the OEM M lips are not a 10. Finish of RW is a 10 and quality is a 10. So many of the ebay parts are thin molded plastic with a layer of CF over it and they are very flimsy. The RW are solid CF. The rear diffuser and rear spoiler are a 10 across the board from RW."
"At the 1 year mark I decided to spice up the car a bit more and add some aerodynamic pieces onto my F82 M4. I decided to email Eric at RW Carbon. There were quite a few companies out there both sponsors and otherwise. I picked them and I am glad I did. While I had the side blades all picked out, and after getting to see some pictures of their newest 3D style rear diffuser all I had to do was to pick a front splitter that I liked. Eric gave me some ideas and after over analyzing the situation I made a decision for the Performance Style Front Lip. I'd like to directly thank Eric for dealing with my multiple questions, for shipping so quickly and being an all-around great guy. "
"Last night, my RW Carbon Fiber Center Diffuser for the BMW F10 M5 came it. The 2x2 weave looks amazing, super light, and it's made of 100% carbon fiber. I pulled the whole OEM diffuser out to get to the center diffuser. The whole thing is held by 3 T27 bolts and 4 pop buttons. To pull the whole diffuser out, I pulled from the outside first. It was super easy to come out. I swapped out the diffuser and everything snapped in perfected. Fitment is top notch. On the difficulty scale of 1-10, this was a 3."
"I made the decision to add some Carbon pieces to my BMW F30 328i and after doing some research for quality and fitment RW Carbon was the place to get it from. I reached out to Eric and pulled the trigger on the carbon fiber varis style front lip, performance style diffuser, and mirror caps. I would recommend them to anyone I was not disappointed."
"Recently went to RW Carbon's warehouse to pick up a R Style rear diffuser for my Mercedes W212. The guys over their are very nice and helped me with a handful of questions. There has been some controversy over RW Carbon's diffuser saying fitment gap was an issue. As any car part, one car is used to make a mold of the part and since tolerances on both the part supplier and of the rear bumper made by Mercedes vary ever so slightly; fitment issues would arise. This being said perfect fitment isn't impossible, just time consuming."