[ctdthrasher]

I’m attempting the exact same thing. But I’m not trying it on a 12mm pump, don’t think it’s worth it. Your definition of streetable is looser than most so it can be done, with a lot of patience. I’m trying a 64.5/73/.83 with external gate fed by a 485. The numbers say it’ll work. We’ll see what reality has in store. If the S300 doesn’t like life I’ll be using a S465ish secondary. Custom Transmission programming and correct stalling will help a ton
FWIW ron Allen had a 6.7 ppump with a 71mm or so secondary and drove it on the streets, so technically that’s streetable lol