exhaust drone/harmonic resonance

ive got the 3 inch TTI exhaust, dynomax super turbos, TTI headers, on a 400 HP at the wheels duster. same drone, and loud too. both inside and outside the car.

my thoughts are to use some header ccollector inserts, as there is NO room for resonators or bigger mufflers. im on a pretty tight budget these days, so the VT's are out for me as well.

anyone try these to reduce noise and drone?