You won’t be disappointed in the H&S Kit. I love mine.
I was going to do the same thing but utilize a 6466 precision. Will need to tweak some piping most likely though to clear some things but it won’t be too bad.
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In talking to Dallas, the only change you should need in piping is the little 90* piece coming off the BW turbo compressor cover outlet. The precision doesnt have the V-Band there that the BW turbo does have so you'd have to modify that bit of it. Everything else should be G2G.
I would initially think to do a 6466 as well but I drove Pete's truck (White Mamba) when he had the 6446 and then drove it again later on with the 6870 he swapped in...the 6870 spooled literally the same if not better than the old 6466 and the truck gained 80whp and a sh*tload more torque with no tuning change if I remember right. It blew my mind.
Keep in mind Pete's setup was a fully built 6.7 motor top to bottom with one of Elite's first built 6R's, twin pumps and small modded RCD injectors so a lot more air and fuel to push the turbo...It def. wasn't a stock setup.
So for a stock fuel truck, the 6466 might be better I would think.
IMO though the option of swapping to a stroker 10mm cp4 capable of supplying 800-850 hp worth of fuel is just so easy (and the exergy pump is more reliable than the stock cp4) to be able to help drive either the 6466 or the 6870 so..... just my .02$