i've got mine torn down right now puttin a 2in snorkel and am waiting on here for a reply. i know some people run 1.5 for 1/2 or less and then jump up to 2in, i can't recal off the top of my head any one running thows mods and haveing 1 1/2 all the way through, your movin more air through the eng now, that might have just put it over the top with the snorkel starving it for air with these new mods. my .02 hope this helps,
bowz
bowz