Waveblaster pipes are fairly hard to find now days. Just post here in the want to buy thread and also on the waveblaster facebook group. Factory pipe, coffman and pro-tec are all good pipes. Pro-tec and coffman pipes are cast aluminum and are heavier than the factory pipe which can cause mounting issues. Some people have had good luck with that where others have not. The factory pipe chamber is not cast and is lighter and properly installed can be problem free.
Wax racing sells factory pipe style manifold's and headpipe's but you will still have to find a chamber. the two common factory pipe chambers are the limited and mod, both are good chambers if you can find one. If you can find a limited pipe it needs the J pipe that goes from the chamber to the waterbox, otherwise you will have to make your own.