The hi-flow cats won't make much of a difference and we definitely plan on making them part of our tuning packages.
Headers can decrease boost on some types of superchargers but we're not sure yet what effect they will have on this kit until we test it. I just want to make sure that everyone is setting their cars up for easy installs later so I'm being a bit cautious with what I recommend right now until our testing gives is completed.
Hi-flow cats won't decrease the boost but they could make the car run a bit lean. We will have a tune though to allow the use of hi-flow's. I don't know how long all of the tunes will take to compile but I imagine it won't take long.
It does help that our project 370Z that we have been messing around with the tuning for the past week does currently have the intake, headers, exhaust, high flow cat combination. And that is the car that we plan on using for our Z supercharger development. Currently the kit is being built on our G37.
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