HFCs really cleaned up the overall tone of my Motordyne. I had test pipes and they were fine, but I got sick of smelling like the car every time I drove it. Combine that with E85, I'm probably burning cleaner than most cars on the street now.
I'm a fan of them, but i will say that it will take more effort when tuning because each cat has slight differences causing some AFR variances in the different cylinder banks. Anyone who is competent and professional should be able to handle it. If you aren't concerned with overall peak power output, then I highly recommend HFCs.
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