Hey Guys,
I haven't been able to spend much time on the forums lately unfortunately as I've been buried in projects here but I wanted to jump in and add the "stillen point of view" on this topic.
We do not recommend high flow cats with forced induction. In our experience, they have a hard time living in the FI environment. We have seen Z's/G's, Camaros, Chargers, Corvettes, all different kinds of cars chew through high flow cats when used in an FI application. We basically say, standard OE cats, or nothing...
In regards to the headers. We have seen them used in conjunction with our supercharger and they work fine. Initially the concern was that there may be some boost loss similar to what we experienced on the VQ35 engines. However, on the VQ37 kit this is not the case. We have not seen a significant fluctuation in boost pressure after installing the headers.
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