Here's a few picts of the interior. I'm not changing too much.
The interior is covered in alcantara. The stock steering wheel & knob are a bit ugly, so I swapped in the Momo Race steering wheel, and the Momo Race Aluminum Airleather knob.
Here's a close up of the oil temp/pressure gauge and boost gauge.
The stock rollcage is covered with alcantara as well.
The M400 gets upgraded seats. They're custom made by Racing Sparco. Sparco makes a very similar one called the Roadster, in a fiberglass shell, and it weighs 16 lbs. The ones they make for the M400 are in carbon fiber, and weigh around 10 lbs each.
It uses a Willans 4-point racing harness. Some people do swap it out for a 5 or 6 point set with wider webbing. I'm not sure if I'm going to.
There's not much room in the footwell because of the large front tires, and mid-engined configuration. I ended up removing the thin dead pedal.