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With the stock E21 323i motor, Intake and Fuel sys can you replace the Intake with a E30 325is intake? straight bolt on ?
or is their any modifications ?


Going to Replace the Fuel sys on 323i with Motronic.

Straight bolt on. Just get the whole dressings from a e30 325i. You want motronic 1.3 as it has the crank position sensor on the toothed pulley at the front instead of on the flywheel in the bell housing. Then there is 8 wires to connect the e30 loom to your fuse box. There is a really good guide somewhere, if I can find it I'll post but its pretty straight forward.