[Target70]

A bad tune is much more dangerous to the engine than any possible header you can put on the car. If we think about it logically, the exhaust is a pipe. Changing the header is mechanically no different than changing out a CBE. If all the AFR calculations are done with the first sensor, which is before the CAT, then the existence of a cat is a non issue, and can't be easily blamed for engine damage. Lots of people have warranty work with a catback installed and have no problems because it has no way of causing the engine to run in a self destructive manner. The header is not any different. However, If you make 1 small change to any of the hundreds of maps in the ecu, you can cause severely damaging conditions for the engine. I am not saying they will ever find out you flashed a tune, and I am definitely not saying any OTS tunes are dangerous to the engine, only that if done wrong, a tune has the potential to destroy just about everything due to running too hot, too rich, or too lean.

I just want others to take this into account. Dealers may still try to blame cats, and headers for any malfunction, but let's be real, changing a header or moving a cat efficiency sensor is only slightly more risky than painting the car a non OEM color.

I can't remember if B-R-Z has already installed the header and is getting the CEL, but based on his stated goals, If he hasn't yet, (although It doesn't work for everyone)I would have tried the defowler first before buying the bung and harness extension.