smooth bellow
putting it on is a bitch tho ... you will want to boil some water and put the couple in the hott water to loosen up the rubber to slide it over the throttle body but after the first time the piece takes shape so removal afterwards and installing is a giffy!!

way better then paying 55 or 60 or 65 dollars... just minus the slp logo!

The crap works great! lolz
You are going to make a few cuts on the coupling to get the right angle. Once you start messing with it, you'll know where to cut. Somewhat of a diagonal cut on both ends.
And if you mess up, your only 6 bucks out of pocket.
Good luck 

