You guys are probably wondering about the HVAC thing....lol
Well, I can't seem to find any word that matches my 5.0" exhaust for the Supra
I know HVAC systems use a lot of 5.0" ducting...
I posted this on other forums as well, so I just copied and pasted by posts
The system starts out 3.25" at the downpipe flange, expands to 4.5" OD immediately. The midpipe is 4.5" ID and all the way to the other slip/flex connection. From there it is 5" OD, and just before the muffler it becomes 5.0" ID with an Aeroturbine AT5050XL muffler. I have designed this exhaust to hug really tight and promote better ground clearance, and it came out pretty well =)
In order to snug the exhaust extremely tight without having it rubbing all over the place was to have an additional exhaust hangers made along with stiffer bushings. Two additional mounts for the DP/MP was also made which bolts onto the transmission (moves along with engine just like how the factory mounts were placed).
The Aeroturbine muffler is f*cking HUGE and I almost shit my pants when the box first arrived at my door. It measures a little over 30" in overall length, but surprisingly, it was lighter than my APEXi muffler...lol :P It is the resonated 5" model, and it sounds great. It's not loud at all, and in fact, quieter than a lot of the 4" straight through systems I have heard. I was glad I managed to cram that thing in there.
Here are some pics (lots of pics)... Enjoy
This is gonna be such a beast 
[U]
Linear Mode
