I believe the specs on the 92 325i are different since they were non vanos. Supposedly 20 hp from a chip, you be the judge.
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A 1992 325 came with 189hp out of the box. I don't know where the 168 came from. And not to sound like an ass, but not all e36's had 189hp. The later model M52 engines had a few more ponies and a lot more torque.
a 1992 325iC was still a e30 with a M20 engine which had 168hp, as did all e30 325's. the M52's came right after the M50 along with OBD-II, they had more displacement to compensate for the new restrictions but the extra tq and flatter powercurves allowed the next generation 2.5L (323i/is around 168-170hp) to out accelerate the previous 325's with around 189hp. both the 323 (2.5L) and 328 had M52 engines, where as the 1992-1995 325's had M50's.
also about the chips, you do not increase your peak hp by 10-15, or whatever is advertised, you gain that amount somewhere along the powerband. if a chip advertises a gain of around 10hp you will probably only gain about 3-5 peak hp.
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