When I got my cub the red line was on the muffler and the blue on the needle valve. On my P51PTS they are just the opposite. on my avistar and tower trainer the vent line is the tube or pipe on the top I am assuming this is true of all rc aircraft with glow plug engines. Are everybody's fuel tubes like mine? I got the cowel in today (2-22-06) a guy from two streets over brought it to me they(ups) had delivered to the wrong house. I looked at the new cowel and it has no engine carb or muffler holes. I guess ill have to cut them out some how this ought to be interesting like the man In the earlier post said they got me again. You know the pitts of it is you buy a plane based on their advertising and it turns out you still have to go to through hoops to get it flying if the ad say's plug and play it should be plug and play if it is not then don't advertise it as such. I have one that I have to fiddle with the servos cut a new cowel and that is not plug and play I payed two hundred dollars more so I wouldn't have to do that kind of stuff and hear I am having to do it. It is not right but I know in the end there is nothing can be done about it. Still Just once I would like to hear a company say oh man I'm sorry let me sweeten the deal buy doing this or that but we know that will never happen. Oh well, sorry for venting have good days and good flights. Patrick