2nd muffler that blows...

Swapped out the glasspack (never meant to be permanent anyway) for a Flowtech Afterburner. At idle inside the truck, as quiet as stock. Above 2000 rpm, sounds great. At 55-60 MPH, in 5th, resontates like a bastard, worse than the glass pack if that is possible. I may try to get some audio outside the truck today and try to upload it later. I'm thinking maybe a Moroso spiral flow infront of the muffler, or a Dynomax bullet, will help diffuse enough sound to make it livable. That or a different tip cut to move the exhaust pulses out from under the bed. Hmmm, that might work.
I'll just need to make a zip folder for a .wav or .mp3 file, right?