Up to a 200bhp shot can be used with direct port. Forget what Wizard say about set-up (They dont want you to blow up so they set it mega rich & you dont get its full benefits) you need to get it mapped on the gas. I have used a 'Nitrogen push' system to maintain bottle pressure it means jet horsepower all the way down a Topspeed run. Without that you will get circa 90% jet horsepower & it will decrease as bottle pressure dies so not ideal for Topspeed running.