Kapdan, I say ugh because you are a novice plain and simple. Your smarty pants attitude proceeds you and am willing to bet that its gotten you into trouble in the past. You know that you voided your warranty by installing any part of that system. Next time, either get your own mechanical license or dig deep down in those smart ass pockets of yours so you can have the job done correctly. Checking for CO emissions will not tell you if the system is operating correctly. This statement is a direct indication that you lack knowledge and should not be playing with fire. Remember, an ounce of prevention is worth a pound of cure. Write that down so you dont forget it.