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Usually 1.5 to 2 lbs of boost for every 5mm to 6mm change in the pulley is what we see. Your going to see a lose of boost with the long tubes of maybe up to 2 lbs, maybe a little less since your going to run somewhat of a cat. Don't know what the high flow lets thru compared to the stock cats. The 85 will probably get you back to where you were with the stock exhaust. I'd buy both and probably go with a griptec or you can buy our pulley down to the 80mm. We haven't built any lower then that yet that I'm aware of
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