Sutton Exhaust installation just about complete. Now I need to hear from you PA-20/22 guys who have already done the installation. How did you handle the wt and balance change short of reweighing? The info supplied by Sutton in the STC only applies to a PA-18 and this multi year, 13 page thread does not address wt & balance. I have also read numerous 337ís for field approvals and they only state that the wt and balance change are recorded in the aircraft records. So what was the weight and arm of the original system and what is the arm of the new?