i am looking into buying a nova engine but i am on a budget, no more than 250. looking at either the stock nova s21p5xlt or a houston tuned n21 w/filled crank. have heard great things about your services and either route i take i will purchase from your online store. my concern about the modded n21 is it not having enough power for the outdoor track i race at (leisure hours raceway). i currently have a stock n21 and i love it but it is on its last life and imo under powered for the outdoor track. what is your opinion???