booster plug

Selling the booster plug for my Speed Twin. Purchased from booster plug directly, had it installed for a couple weeks, didn’t like it, and has been sitting in the box ever since (probably 6 months). We can discuss shipping costs, but I’m asking $75 usd.

I added the following (and deleted) to my Street twin. DNA high flow filter Booster plug snorkel removal Test results sans dyno Adding the Booster Plug to my totally stock ST yielded no advantage, in fact it decreased its performance. (Due to a pre-existing rich A/F I found out), so I removed...