Depends....

A PT will probably match your porting and run decent but it'll cost you close to $400 for a new PT, if you can pick up a used PT for $225 or less I'd definitely do it.

If you gotta buy a new one and you want the best dune riding pipe I'd look at Jerry Hall, it's expensive but you won't be looking for more horsepower just after you paid a bunch of money for your new set up.......been there done that.

What dunes do you ride?