I personally was not a big fan of Cartek way back in the day (mid-'00s). For a number of things, but up near the top would be Julio tuning my still pretty new T/A while smoking a cigar in it. And I enjoy a cigar but wasn't particularly happy about that. Locking the PCM would be another. Crappy customer service unless you wanted to drop 5 figures on their heads/cam packages and them doing all the work.