You'll get many different answers, driving styles different, tracks are different. I have tested many pipes, alot of the ones mentioned.
I only keep two pipes in my box now, the 2035 and the 2039. Lately I have really liked the 2039. Still has plenty of bottom end but it runs stronger on top end. Mileage on the two are about the same.
I tested the re-11 (OS pipes are too rich for my blood, supposed to be the same as a 2050). In a back to back test, same day same track, all within 20 minutes, the re-11 ran 15 degrees hotter and got 25 secs less run time than the 2035, and it didn't have as much bottom or mid range, and I didn't notice any significant gains on top either. And yes, I retuned for the pipe, not just change it and run.