John DeFini's Super Clean E46 M3 Track Build

A few months ago we were contacted by a customer that wanted to do a front splitter build for his E46 M3. I didn’t know what he was building or what his plans were, but after some back and forth conversations he ended up wanting to do a custom splitter build similar to my current setup which is wider to support winglets and has enough area to support tire spats.

I ended up cutting up a splitter from 1/4″ alumalite paired with our Quick-Release E46 Splitter Brackets and shipped it over along with a few other items. A few weeks went by and I came across his post on Facebook after completing his build and wow I was so happy to see this E46 M3 across the country with the splitter we made for him. Not only was I happy to see the splitter, but it was such a clean build overall and I asked him for pictures to do a write up on the website.

Some additional parts on the car included carbon fiber headlight blanks, HARD Motorsport brake duct kit, AeroCatch fastners, hood vents, fender vents, lightweight racing mirrors, Stoptech BBK, the whole interior was upgraded, etc.

The E46 M3 build is looking great already, but I’m sure there are more things to come including the splitter winglets. As an extra option, additional splitter diffusers can be installed on to the front splitter to increase downforce even more. I currently have the RSFuture splitter diffusers installed on my E46 M3.

The ACS lip was mounted using screws and black-coated rivets. The lip was placed on a table to ensure the fitment was perfectly flat and even.

For the tire spats, John ended up custom fabricating a bracket to hold the spats in place. On my car I went with the tap screw method against the fender, but the the bracket is much cleaner and is easier to remove.

Extra material was placed in between the ACS lip and splitter to ensure no wind gets past the bumper.