haha told you that you ran 16's :fawk:
haha back on topic...a 15.5 should probably be a bit lower than an 88 mph trap. My friend matt ran a 15.1 @ 79-80 with a 2.2X 60 foot and i doubt a 1-2 mph lower trap is gonna drop you from a 15.1 to a 15.5.
a 87 trap should be good for about a 15.4-15.5 with a 2.2X 60 foot. With a 2.4X 60 foot it's probably like a 15.7-15.9