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I had a hks uel header with my hks v2 supercharger
When I switcher over to a ACE 350 header I was able to run at least 0.4 leaner and gained almost 2 degrees of ignition timing without knocking, and the torque dip that was present with hks header was total filled up and you could feel the car pulling a lot stronger around 4k rpm
I vote for Ace header
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