RE: Hangar 9 Mustang 150
Blake,
If you haven't already seen them, take a look at the Gallery section on my website. There are a couple of nicely done Hangar 9 -150 Mustangs with my exhaust kits.
I also have an inexpensive kit for the air filter covers - much easier than trying to drill the holes and more scale like than a decal.
Whatever way you go, be sure to put the bottom of the exhaust fairings (not the exhaust stacks) on the thrust centerline. Don't know if it's been corrected yet, but the original kit location was too high up on the cowl.