We were able to idle the carb p-port RX8 engine down to
1200 RPM unlike the p-port 13B at 2000 to 2500 RPM.

The noise with the header and the straight
through muffler was very tolerable. My guess not more
that 110 db standing right next to it. I have an 8 meg video
I'll upload to the web site.

The EGT's were in the 1500 to 1600 degree F range
as opposed to the 13B p-port in the 1600 to 1800 degree F range.