We have always considered the cowl to be a limiting factor in the Cherokee's performance potential, so we proceeded to look for ways to reduce the frontal surface area and control the cooling air through the cowl.

We have been working on a better performing exhaust for years and decided to combine the two projects since the new exhaust would need to fit our improved cowl. We are in the final testing stage of our new exhaust system. This is a TRUE TUNED EXHAUST, designed to extract every bit of available horsepower from your PA-28.

The following are pictures from July 2004 as it was flown to Oshkosh.

Initial testing with new cowl design and new exhaust system:
Field elevation: 880ft
Ambient temp: 85f (Hot and humid) Winds: < 5mph
Time to Climb to 7880ft: 10min 35sec
Climb Speed: 120-130mph
Avg. Rate of Climb: 661fpm
Economy cruise: 140mph@ 6.5gph
Cruise@75% power: 158@ 9.2gph