Chris, I have heard good things about the OS TZ but they are new to the on-road market. Your best bet is to stay with novarossi base motors like Rex,Top, and Novarossi. I have a brand new Rex Re 12 S3 for buy it now $190.00 with free shipping, on ebay. Item # 6015797885 go to www.ebay.com
you can also search novarossi. This motor is roar legal. I have great success with Rex motors in the .12 and the Rex Re is a fast, easy to tune and will last a very long time. Later Dude
BTW, you can also go to www.novarossi.com
for more info.