Just bolted one on my car Only driven about a half a mile, alternator was out and ran out of juice in my uncharged battery when I firsted cranked it, idle was at 17 to 1 afr but within about 20 seconds it had it down to 13.9 to 1 On vacation now and can’t wait to get it back to play with it. Headed to Drag Week this year with it so we will see how it does