SoundDown is a great product. Interesting choice on exhaust I use geeb Industries which is a stainless steel corrugated tube with welded on ends also another great alternative from spiral seemed original flex pipes that they used. Looks very nice. You know mr. Liberty designs that generator Bay so if you have to take the generator out in a pinch all you have to disconnect is the exhaust and you can take it out and set it on the floor outside the door without unhooking anything else if need be. I considered the perforated aluminum sheets sound down also sells but I decided against it I think it'll just make it harder to clean.