RE: K&B Sportster Club
I run my 65 with a BCM low DB muffler. I have people come up to me and ask what I'm flying as it sounds more like a 4-stroke than anything. I tell them what it is and they have to see it after landing as they don't believe it. I put it on 45 sized aerobatic planes using the spider backplate soft mounted with a 13 x 5 prop. Great power and extended verticals without a lot of speed. The extra airflow over the control surfaces makes for some really smooth landings. I Really like it in that role!