Okay, so the black Mac muffler is more aerodynamic and a little better power wise than a stock muffler. And the Mac tuned pipe is best for power output, but a little less aerodynamic and probably weighs more.

I plan on putting this on my TT .46 in a F-20 tigershark speed prop plane. I know that HP/RPM is important to speed, but so it weight and drag....not to mention wing loading the heavier the plane....

Anymore opinions?