Either are a great option. I can promise both will have great results. The 3rd gear on the streets isn't too bad if you have a highway close. For the most part you only have to get to about 6000 rpms. We can do above that in a brief session so you never have to speed to much. If you can find a nice 70-75mph speed limit on the highway you wont go more than like 10-12mph over teh speed limit most of the time (although we obviously expect everyone we etune to be doing this on a closed course).