Its' matter of personal preference and what a guy relates to. I like ProStock, NA, high tech. So I have stuck pretty much to NA, but I did go to M5 fuel. I love the smell of Nitro in the morning! Smells just like teargas when it burns, cause it is did you know that with enough fumes getting to your eyes, you tear up so bad the sting goes away? Drivings a bit blurry, but he!! the ride is a bit more fun!!