Fuckk I can’t remember the name of the palce my buddy dave went when he had a custom driveshaft made when he did a 5 speed swap on an M30, wasent to bad at all he had to go back twice because he fucked up the measurement by a cunt hair the first time still ended up being <$200
As far as an exhaust goes, go see Dave at Inline Performance on altamont ave in rotterdam, he does quality work and is reasonably priced.