something ive found out on them new cr5 intake boots is theyre pretty soft rubber and if the oe clamp is bent even the slightest bit (and even if it isnt bent) it causes a small leak between the boot ID and carb OD. a more sturdy clamp like the style used on the rad valves would work far better i think as they hold a circle shape much better and compress the boot eqaully on the circumference. im in the process of finding something for mine as ive tried everything to keep it from leaking but no luck. tried new oem clamps, tighting it alot and barley tighteneing it. nothing has worked so far. the gemi size 50 like the rad valve is what im going to try and find.