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I’m doing a hellcat swap in my 70 dart. I’m wanting info or rather anyones personal experiences with sound German stand alone for 8hp90. Is it plug and go or need tuned? Self learning?

Anyone running a 727 behind a hellcat and if so what all have you done to build it to last??

i got a 8 1 /4 with supposedly 3.91 gear how can i prove this to be true or otherwise?