Can you qualify that mark.
Ease of install?
We think they are easy, and the fittment is 100% spot on, this is the answer to your next question also.
Build quality?
Beautiful welding and finish, coated inside and out for heat retension inside (faster flow) and outside for cooler running.
Sound?
The tubes are thiner and lighter then S.S. ones so you hear a little more, but they sound great IMO. A lot of this is subjective of course and the catback will make the sound in the end.
Performance?
Lou's "pickle" collector produces great torque through the midrange and on the road will beat any header regardless of dyno numbers. There are header builders that have actually proved this to themselves, they are not cheap, but the quality is there.
Price?