I dont think you will have drone unless you put the glasspacks all the way at the back. make sure you run the pipes out the side or back too, not under that echo chamber.
as a side note, that video I posted was for the for sale thread when I sold the 283 out of that bent frame, it was up for sale maybe 2 hours and the guy insisted on taking that exhaust
glasspacks man, thats the snip snap.