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Apparently, Longtubes can be installed without cats and the motor runs fine. Although the CEL is lit. I reason that means the motor will run fine with cat deletes as well. I would love to install long tube headers but I can't justify $3000 and still having a CEL lit. It's worth $200 to me for the cat deletes to learn if the motor makes any more power. If it does, and I can't stand the CEL, I will forget about track and get a custom tune that turns off the O2 sensors. I really like Trak Key though. Hopefully the red key and the deletes will get along.