I seal all my engines to prevent any problems. I haven't had and with the 3 grp's I have but I don't want to take the chance. It doesn't matter what engine I run I seal it from the beginning. As for pipe dynamite 086 or 053 the grp 2053 is on the restrictive side and the trinity bad boy pipe was terrible lasted 2 laps and has been new and shiny in my pit box ever since.