I don't know of any M44 specialists company. Searching around 318ti.org might turn up something. But I doubt it. The M44 is just not that big of a market. Also, the market potential for M44 upgrades has always been limited by the existence of the 6 cyl cars. Cheaper and easier to trade for a 6 cyl car as opposed to bringing a M44 up to the same performance level.
IMHO, the best mod for your car would be a suspension upgrade. A simple shock upgrade, or if the budget allows, TC Kline's SA coilovers, will transform the car's handling.
Last edited by dougmcintyre; 12-03-2012 at 12:45 PM.