I don't know much about the A1 except that it made more horsepower than the Tangerine and that it makes for a clearance issue for me. I have had a Tangerine for 15 months on my 71 super. I have a 2321 (71 x 102) T4 from Jake and because of the way I use my car I would have purchased the Tangerine no matter what. Torque is awesome, horsepower sells. I drive my car between 200 to 300 miles per week these days and do drive it everywhere, street, dirt roads, over curbs, off roads. The clearance that is achieved with the Tangerine can not be met by any other system I have looked at. I regularly back into parking spaces and never have to worry about dragging my engine much less my exhaust, the tires are the only things that hit. My car sits at or above stock level because I need it to go any where. If you decide to go with the A1 I would understand. The Tangerine was and I'm sure still is very expensive. I know from experience that you will have NO issues with workmanship or with clearance with the Tangerine.
Oh, my exhaust has a Phase 9 and a Quiet Can, not that cool muff that exits the stock holes. Just remembered, the only thing that is a pain in the butt with the Tangerine is that you have to drop the system to adjust the valves. A small price to pay if clearance is of any importance to you.
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