I have standardized on the Sigtronics SPA400n for high noise cockpits. It works in the P-51 quite well and that is a VERY loud cockpit. I always have to adjust the squelch after takeoff and then again when I bring the power back to cruise.
Works well in the PT22 but you obviously can't let the mic get into the wind.

Sigtronics will modify any SPA400 to an N for a reasonable cost.

I use Bose 2 headsets for really loud cockpits because they work better with the lower frequencies than the Bose 10 or 20. I don't like the leather soft helmets so I just use the headset by itself.

I am very happy with the Becker 4201 and I use them in all of my aircraft. I do not use their built in intercom.

When Bose came out with the prototype of the 10 they sent me an early version and I did a flight test in several of my planes. It did not work well in the Mustang or even the T-34. They agreed that it wasn't as good with the really loud low frequencies. I even video taped the testing and showed them how many negative G's before it would come off my head in the Extra 300.

One of the highlights for me of Airventure this year was handing a check to Tom Brown for his 1936 Waco ZPF 6 project. It's not a flying airplane by any means at this point consisting of drawings and a part of a fuselage. But, hopefully, in a few years it will once again be flying.

The project is the fifth acquisition out of a planned six Waco F models. My hope is to eventually have an example of all the principal F models made by Waco during the decade from 1930 to 1940.

Information and history of this airframe, which is one of only 5 F6's made (and only one is currently in flying condition) is on my website here:

https://dreamwacos.com/waco-zpf-6/

I got the PS Engineering 1200 installed in the F3 and flew it into and out of Airventure. It worked great! I could leave the intercom on all the time and hear controllers well as well as communicate with my front seat passenger. When in isolate mode it is obviously clearer as there is no background noise.

Passenger was wearing a DC headset with a leather mike muff cover.

I know guys who like to fly their open cockpit biplanes across the country. They enjoy seeing the sites low and slow. I've done it. I get it. But its not my favorite thing to do in an open cockpit biplane. After a while it's tiring. And in the summer as the day wears on its hot and can get fairly bumpy, or even turbulent, down low.

I prefer shorter flights, often only an hour or so, to local destinations or no destination at all. I could do that every day. I've been at it the last three days in a row and am looking forward to more aimless flying tomorrow.

The FF picture below defines "piddling" around to me. Doing nothing much, going nowhere, no plan, no purpose, nowhere to be, no deadline except fuel, fun til it's time to head to the barn.

This morning when I got to Page Airport I thought I'd do a few landings for fun. Coming through the inversion layer around 100 feet to cool ground air on a warm morning is like diving into a cool swimming pool, or wiping a cold glass of tea across the forehead on a hot day. Doing it over and over again is almost sinful.

Such is the aviation poetry of life...

And?