Both the tunnels are powered with stock OS and SB pipe, I was planning to use a tuned piston & sleeve by James from O.E.R. for both tunnels but James has closed his shop.
Have not measured the speeds yet, will let you know soon.
Greets Marc
(I'm also testing with my Ossi tunnel at this moment)
hey Marc....great to see someone else with a Skater from H&M..I have the small boat and the Skater XL...What speeds are you getting with your Skater 3.5...cheers Baz