Ok etter hinsides mye forskning fant jeg dette:
Start off by installing the fuel injectors onto the fuel rail. I decided to use M50 injectors because of its higher flow rate, as the stock 325i injectors are known to lean out at very high RPM.
You can also use injectors from a 535i/635i/735i, or Ford Mustang 5.0, though each one has a different flow rate. So which one should you buy? Depends on what works for your application. To figure out how much power an injector is good for, take the flow rate (cc/min) and divide it by 5. That will give you the maximum horsepower that injector can support. Multiply that number by 6 and that will tell you how much total horsepower all six injectors can support. (This formula assumes zero injector clogging, 100% injector duty cycle, and 14.7:1 air fuel ratio. Since injectors tend to clog over time, 100% duty overloads the injectors, and 14.7 isn't always a constant, it is better to get injectors that moderately exceed the amount of power your car will produce.) For example, the stock E30 325i fuel injector is rated at 149cc/min. Divided by 5, it can support 29.8 horsepower per injector, or 178.8 max brake horsepower. That's sufficient for stock 325i's, but for modified cars, it's not good enough. Here' are a few upgrades you can use:
S52 injector (from E36 M3 [1996+], M Coupe, M Roadster)
BMW Part Number: 13-64-1-703-819
Bosch Part Number: 0-280-150-440
Flow Rate: 205 cc/min
Color: Burgundy
Maximum HP Supported (100% DC): 246
Ford Mustang 5.0 injector
Ford Part Number: FOTE D5B
Bosch Part Number: 0-280-150-556
Flow Rate: 200 cc/min
Color: Yellow
Maximum HP Supported (100% DC): 240
M50/M52 injector (from E36 325i/325is/323is)
BMW Part Number: 13-64-1-730-060
Bosch Part Number: 0-280-150-415
Flow Rate: 190 cc/min
Color: Pale Green
Maximum HP Supported (100% DC): 228
M30 injector (from E28 535i/535is, E24 635CSi, E23 735i)
BMW Part Number: 13-64-1-276-149
Bosch Part Number: 0-280-150-203
Flow Rate: 185 cc/min
Color:
Maximum HP Supported (100% DC): 222