Before Aero people mostly waited for thier exhaust to rot out before changing it. Today we have a reason to change it before it rots......Aero increases fuel economy, I know I own one on my RV.....10-15% easy
With gas at $4.00 per gallon and rising it's a no brainer why Aero is starting to sell many mufflers.
I'm the smart one on the right, or was that the left. RV'ing is fun with my Aero Exhaust !