The P5 is made by REX, another name for novarossi - great engine, lots of low end power.

I am an RB fan, I have an RB C5 and an S7 in my buggies, a Rody C5 in my 8th scale on road and a Rody V12 in my 10th scale - cannot say enough good things about them, never had a single problem. I love that pipe too.