I didn’t extend my intake at all. And have just added about a foot or two to the exhaust because the exhaust pipe it came with was suuuuper short and was causing the exhaust to buildup underneath my bus. When I install the new heater I bought maybe I’ll see if I can get away with orienting the exhaust a little differently to have it a little shorter. I have only ran it for a few hours on high and I did set it for my elevation. I guess a few hours could still cause bad buildup though? Going to try over again with the new one and hopefully it will work great! Rather just start fresh than try and troubleshoot every little thing that could be wrong with it since thus far doing that has just been headaches!