The engine is still a small block, so be it only by .01 ci but pretty much everything under .21 has the same port. The Trinity pipe comes with 2 manifolds, one for BB and one for SB's.
I'm currently using the OS .18TM and love it. I race only and it performs the best for the tracks I run at. I may have it modded by TNT when it's time. I was going to do it now but the mill is still good and I ended up picking up an LSP-r and added a Nova P5X to it. So I'll run the TM til she pukes and I have a new piston sleeve for it that will go to TNT when it's ready. Slayden has said that the new 3.3R makes more power than the TZ. Yeah, yeah he's sponsored by Traxxas so you'd think he is going to say that, but I've seen the guy run and have seen his rigs, if there's aftermarket stuff that's better he uses it, like the TZ.