From what I've seen over the years only about 5% of the customers are actually interested in finding more power after a dyno session. Most customers just want to get the engine home so they can put it in the car and get back to racing.
Most customers don't want to spend the extra dyno money. Also, there is zero reason to test stuff that doesn't fit the car. Why test carb spacers, if you don't have room for them? What good are dyno headers if they don't fit your chassis, other than they fit the dyno?
