340 exhaust system

Dynomax! 3-pass turbos
They scream at 7000.
but nice and quiet while cruising at 65= 2240, with no drone at all. Worth every penny.
Not that I needed it but I ran dual 3s all the way, with turn-downs. I never really liked the sound of rectangular tips. Plus those aim the sound of the screaming engine right at the cops ears. At least with turn-downs I stand a chance.
Your 340 will like the crossover. When I cut mine out (367 cubes), I felt the low-rpm torque loss right away. I mean Instantly.