I assume you're inquiring about the 4 cyl QR25DE engine. This engine was used starting in 2002 to the present. A 2002-2006 header will bolt on to your 2008 engine. However the bottom flange of the CAT housing that connects to the exhaust pipe may be of a different angle making it impossible to connect. It also turns out that the Nissan part numbers appear to be different. You'll also need to check out the sensor connections. There were some years that the header used dual CATs.
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