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then tel me how to gain horse without swapping ^^^
The general consensus is that there is very little power to be gained form an M20B25 without serious modifications. A chip will help, but don't expect crazy gains. Modifications to the exhaust system are purely superficial without major head work to improve flow. As for the cold air intake, the E30's stock intake is a cold air intake and the stock airbox was actually designed quite well so the only reason to put in an aftermarket intake is for better sound. The best thing you can do for a B25 short of a turbo is to do regular maintenance, chip it, do injectors, and get a MAF. If this doesn't give you the kind of power that you're looking for then the best choices become a turbo or an engine swap.
Edit: I'm also pretty sure that not making multiple threads asking the same question and searching before you ask a question will add at least 50bhp. ;)
The general consensus is that there is very little power to be gained form an M20B25 without serious modifications. A chip will help, but don't expect crazy gains. Modifications to the exhaust system are purely superficial without major head work to improve flow. As for the cold air intake, the E30's stock intake is a cold air intake and the stock airbox was actually designed quite well so the only reason to put in an aftermarket intake is for better sound. The best thing you can do for a B25 short of a turbo is to do regular maintenance, chip it, do injectors, and get a MAF. If this doesn't give you the kind of power that you're looking for then the best choices become a turbo or an engine swap.
This is good info. A 4.10 rear diff will help as well. As long as you are running an "I" motor. Go here, there is info.
Just slap stickers of whats not in your car and add a clunky bodykit!
TBH, what part do you want your car faster at? On twisties, drag, track, what?
If youre looking for a bang for your buck gains, either a chip, MAF, weight reduction etc.
Stick with the factory airbox, you wont notice any gain unless youre doing major rework on your engine, best route would be an S50 or S52 swap
E30s arent gonna be easy if you want it to go "fast" theres no competition, deal with what you have and get the upgrades thatll be satisfactory to you!
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