I ran the Thundermax and the Bub true dual with crossover system until I got the recall and had the 4th rebuild on my '07. Changed back to stock to keep from having any questions asked for the warranty work. I have run the stock setup for a few thousand miles and decided to put the TMax back with a set of Fullsac baffled mufflers and the OEM header. (BUB was way loud for me). Problem: TMax doesn't see the O2 sensors now that I have reinstalled. Complete unit has been sent back to Zippers and tested out OK. They did replace the ECM "just because". Is there a way to test the sensors off the bike since the module doesn't see them? Hate to pay the price for new ones before testing the old. Any ideas?? Thanks for any ideas/help you might have.