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I haven't done it yet to mine (I never drive it, and my girl seems to like the throttle lag, she can't tell why I complain), but yes, it should significantly help things. The throttle body is not electrically grounded through the plastic intake piping OR the block, and there's only a tiny gauge ground wire in the harness. Tossing a decent true ground cable on there helps.
There's actually about 6 places that could use real grounding, lots of the "ricers" with the M3s run a grounding spider right off the negative battery post, with 5 or 6 decent sized (10 gauge) cables all over the engine bay.
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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