Interesting design ... too bad you had to work around that enormous lunch box. I'm curious to know if that 1mpg you observed stay's consistent. It makes sense that it would. I've ordered my FSWERKS Stealth exhaust, so the $ for mods is running low. That said, I am interested, just not right off. What were you considering for a cost (just ballpark)?
Also ... I'd be even more interested in swapping out the front piece (it really is more like a peice of carpet / felt than anything else). When you mentioned sound testing ... hmmm, good point. If the new aluminum piece introduces too much noise, why not coat the side facing the engine w/ plasti dip (or something else that'd have sound damping properties but would more heat resistant)?
Gold Nugget: '12, 400A, Wintr Pckg, Yellow Blaze HB
Mods: Llumar Tint:35 / 20; K&N fltr + Snrkl Del.; Splashgrds; Grill Pinstripes
Hatch Nation #174