i would go with the h22. even if you got the 220hp rated k20, you are talking about twice the price for 20 more horsepower. on the other hand, the k20 is better for boosting than the h22. the h22 is hit or miss. i have heard people pushing 16lbs on a stock h22 but i personally knew a guy that rode around on 7lbs for a year, pushed it up to 9lbs and blew it in a day. i also knew a guy with a k20 that boosted his with 16lbs and used it as a daily driver and had no problems. if you plan on boosting, spend the extra money and get a k20 but if you are going na, go with the h22