I've never tried the jp pipes as they are not EFRA approved for racing in europe but I use the HN 2047 ..( the GO 2047 is exactly the same )on both my .21 7port and the .21R 3 port and it makes insane power everywhere..maybe a touch more top than bottom end power but the heavier clutch springs counter that..never had a problem passing anything except the black speed tuned OS v-spec but thats a truly silly motor and costs $400+ ..