Ditto what everyone else said.
If you run it, run a strainer for sure. There isn't much clearance from the inner/outer shells so they do clog easily and can be a pain to unclog. A strainer fixes that problem, get one from Mcmaster.
Most of them do need the top mounting bracket holes slotted to get the flanges to mate up properly so the o-rings don't blow. I had to cut the stinger end and reattach it with a piece of hose at an angle to allow that---once I did, no more o-rings blowing, plus I switched to Viton o-rings.
Great pipe, but I opted for the simplicity of a B pipe after several years of running it.
The freestyle version has a very slightly longer rear section to lower the hit a few hundred rpms, they are harder to remove than the race version but just looking at one you won't be able to tell. You'd have to have one of each side by side to notice the difference.