I bought a Big Bee here:

http://www.sheldonshobbies.com/listing/hotdealair.html

Good or bad, I also bought a Macs tuned pipe here as well. (MAC1196)

http://www.btown.com/sheldons/listing/mac.html

I need to either make a header or suck it up and buy one direct from Macs (expensive).

I've raised and enlarged the exhaust ports on the Ryobi and installed a new ring. The compression is definately better than the stock one. I need to pick up a tach. The engine does seem to run stronger (screwed into a fencepost) but don't have any numbers to prove it. I'll need the tach to try out the pipe.

I get a big grin every time I fire up that motor!

Mark Napier