Originally Posted by
Frank L
I don't drill the cap and just use the foam. They work very well. If you drill the cap you better change the bladder every time you change oil. If that bladder goes then there goes allying shock oil.
Not drilling the cap or using a vented cap defeats the purpose of the mod/foam as air pressure will still be contained behind the bladder and rebound will still change. When rebound changes, ride height changes which is what the mod is trying to eliminate. You need the vent hole for the foam to work as it is supposed to.
