Flyboy2000,
I just finished building my 2.3 and actually had the test flight last weekend. The power is not an issue at all using the KS1060 pipe and a mezjlik 23X8 prop. I have a 12 page thread on the build along with Video of the test flight on my website if you want to take a look (
www.billhigginsjr.com) The plane finished out at 19lbs 07oz and on the 8th run of the engine is turning about 6810rpm.
Bill Higgins Jr.