Quote:
Originally Posted by football751
So basically what the OFT does is tune the ECU so you don't throw any codes? Are all dealers going to go into your ECU to see if you've installed a tune? Since the OFT is a tune and not a piggyback, there's no physical evidence that you've tuned it. They'd have to pull the ECU data to see it from my understanding.
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Generally any tune for catless headers will adjust AFR ignition timing valve timing ect for best horsepower from headers and it will also disable the CEL code for Cat Efficiency which is the one you get when removing cat.
With OFT you can flash back to stock but you will probably then get the CEL fro catless headers, the service guys are going to notice the headers anyway so little point in flashing back to stock.
If no tune use O2 sensor spacer on second O2 sensor. The first O2 sensor is used for AFR sensing for engine so its not effected (ie one before the CAT in header.
The 02 sensor spacers are put on the secondary O2 sensor to "fool" it to thinking the cat is still their, sometimes you will still get the odd CEL thrown.