Thanks for the updates!
I have that feeling to about the Pulley, but my tunner says that part of his job is to manage the proper sync of all elements due pulley needs to take account when you are tuning in the ECU (he speak about someting sync the revs and the and the power of the engine to not over speed the pulley and get melted, but also indicates that thats may happens in FI applications)
about the headers, when I bought the exaust i did it buy from headers to the end, including CAT from OEM Nissan Nismo codes. Up to now i still thinking Nimos headers and stock headers are the same.
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