I am waiting on my supercharger kit now and I have a few other goodies up my sleeve.

Just chip tuning alone wont do that trick, other mods will help give it a nice push but forced induction is almost the best way to go, if you looking for substantial power gains.

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2001 X5 4.4i Soon to be Supercharged
1994 325is Custom Supercharged
1987 325e Custom Turbocharged
BMWCCA MEMBER #399120