Just decided to post the sound of these puppies idling. They have that typical straight through sound, with a sound level of 83db at idle, measured 25 inches away from the tailpipes ( recorded on google pixel 3 XL, sound meter app). They drone at cruise but not as bad as the 40s I had. Those were good times though. The car sounded pretty rowdy at 750rpm, but the T-slots were completely covered (also maxed out on secondary adjustment).
'69 340
-x-heads 2.02/1.6 valves
-Keith Black hyper...
Flowmaster Flowfx sound on 340
