Like to hear from those who put a 3 in complete exhaust in a Dart (70) .......

Brooks James said

I've got new 3" offset Borla Stainless, Doug's D453 already. For now I'm thinking 90 degree down turns before the axle. I'll Come back later when I have more time and money

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Brooks, if you DO do the turndowns before the back axle, tip the turndowns TOWARD each other, at about a 20-30° angle.
It smooths the sound, and pushes the exhaust out the back, instead of onto the ground, and blowing whatever onto the bottom of the car, or other guys cars.
That's what I did on this car, and it works.