A buddy of mine was running one flame arrestor on the front carb, and nothing on the back carb. Anyways, when is motor hicupped, a 4-5 foot flame shot out of the scoop between him and the passanger. Oh, not to mention the scoop was now bent since the front was attached and the back part wasn't. IF you have a scoop in a boat that may get water in it when driving through chop, then your boating in water too big for your boat. With the flame arrestors, I don't think a little water here and there will get by when it's a spray. Like I said before, if your boating where good amounts of water is going into the scoop, then you shouldn't be boating in those conditions with that boat. Good Luck.
HBjet
[This message has been edited by HBjet (edited March 23, 2002).]