Sure Mike, drill a big hole in the hood over the throttle body and tie a Quaker Oats container around the throttle body, paint it with flames and get a "no fear" decal for the top of the windshield.. . Seriously, you best bet is to look elsewhere for performance increases. The stock setup is OK for most applications. If you want increased performance, try a high lift, longer duration cam. This will boost your mid high and top end power curve. You might gain some benefit from the K&N there. You could get a bigger engine also. How much do you want to spend???

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Jeff L
1987 300e
1989 300e
1987 BMW 325