67 camaro exhaust question

I have a 350 with some goodies on it! lol and i just bought ceramic coated headers from dynomax with 3" flange. i was wondering i bought som cut outs and i have true dual were should i place the cutouts? behid the h pipe or behind the headers? i want it to be loud im not really goin for performance i have about 150 puonds of audio equipment in the trunk so...

thanks if u want pics tell me i have plenty