Q: add power/speed on 1994 BMW 325is

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
what would be the best parts to use for gaining power/speed?
and if i put a new muffler on it what would be the best for bmws
(1) Answer
Running highest octane fuel available and freeing up the intake and exhaust would be the best step

Anything further might reduce the market value of your car and running values
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