Quote Originally Posted by winfred
the problem is good distribution through the manifold, most cheep nos systems are designed for "wet mainfolds" where they are designed to flow fuel and air evenly to all cylinders and a little more fuel and air (nos = oxidizer) from a single injector works good, the bmw uses a "dry manifold" that wasn't designed to deliver a fuel charge, imho the safest system would be one with a fuel/nos nozzle in every port just like the factory injectors, but that style of system is not cheep, easy to install or for small power increases, now people have run cheepo nos on 535s for years and i suppose a few melted pistons have resulted from pushing the limmits over the years, you just need to research what the safe limmit is for a cheep system and realize it's a dice roll
why bother installing a nozzle into every port if one can simply put one before the throttle plate?