Originally Posted by Heep-J4000
What is the reason that you didn't keep the oval and cut also a oval in the front!?
1. Mostly because I didn't think that the 4B required anymore air than a 4.5 dia" (114.3mm) pipe could deliver. And I'm not planning to increase the horse power so the extra air flow isn't needed.
2. Although I do like overkill and the oval would fit that requirement, But it would take a lot more sheet metal cutting/welding to fit the oval in.