Just took the Accell SLM off of my 09 Muscle. Wasnt very pleased with the performance of this product and wanted to let everyone know that they should go with a diff product. With the Accell my bike was running lean and popping and backfiring alot. I have the V&H slip ons. I went with the Fuelpak and noticed instant performance diff. The bike runs and sounds better. Anyway just my 2cents.