M-6 but it's not my daily driver. Wouldn't want to spend much time in traffic with the six. You can't beat a manual for fun when you're in the mountains but I agree the stock shifter lacks feel. In fact, it's the sloppiest manual I've ever owned and that includes four Mustang GTs, an MGBGT, a Porsche 911 (early era with the long shift handle), an Alpha Romero (pretty damn sloppy), an XKE, and a Fiat 124. Hell, even a 3-speed on-the-floor Toyota Land Cruiser ('74) I owned had more feel than the GTO. All that said, I've never had a car I liked more. I'm just cautious when shifting quickly (rarely) and especially from second to third. If there was a good shop in my town, I'd have the Ripshifter installed.