I was just trying to make it easy on you [emoji4]Hey, I thought we were upside down here in Australia.
To make a really good "short-pipe" you need to know your stuff to the extreme to calculate it right - and be a really good welder into the bargain, to cram it into a reasonably sized outer shell.
Most people aren't able to do any of that, and then comes the need to carburet and port the engine correctly as well - actually it should happen in the opposite order..
Top end is great though, I've never seen red sealant before....