pat, what we do is take the filter thats in the tube and edm it. it will open it up to allow 50-60% more flow. you can accually see straight thru them, so it gives a direct flow( without turbulence causeing restriction) into the injector, it also increases availible volume to the injectors. we get them, edm them then send them out for testing, then they get sold. i will get back to you on the price on wed cause my tester just had a price increase, very resonable though. as for a power increase, well no dyno test's but rail psi holds alot better and seems to be unaffected by heavy duration----as long as the cp3 you have can keep up. responce is also much better. i would also highly reccomend a 3 micron or better filter for your fuel as the filter in the tube has been edm'ed. thanks