I finally managed to get around to putting in my dyna coil kit yesterday. It took about an hour and I must say well worth it. My bike no longer stumbles at the low rpm range, starts more crisply and is overall smoother throughout the entire rpm range. Kudos to Chris Kelly and CA-Cycleworks for wonderful easy to follow instructions. A must do mod for earlier carbed monsters IMHO ;D ;D ;D (don't know about FI monsters).