My pro is stock 163, but my 04 Rev has a 162 in a 151 tunnel just installed a custom longer XP Rear bumper have a nylon strap around the rear bumper down to the snowflap to keep it angled up higher from getting sucked into the track, cools fine has been that way 2yrs now.
might be able to see it in the pic of the 2sleds on bottom of my sig.
Wildcard