Sinister Diesel may have started out as MKM Custom but have shown, year after year, that they are a little bit more rebel than just another custom shop. With their finger on the performance diesel heartbeat they not only partner with some of the biggest names in diesel they also manufacture some of the best parts available. They believe so strongly in their product, that they trademarked 'The Color Blue' that most all their parts come in. Hows that for pride in workmanship?!