I know Solo sells a set that is supposed to eliminate drone but this hasn't been entirely successful. If you are trying to kill drone the only way I've seen it done successfully is with J-pipes. Also available from Solo.
2014 Camaro Silver Ice 2LT +RS
2009 G8 V6 PBM Premium+Comfort&Sound = SOLD
mods: Rotofab CAI, mid-muffler and resonator delete, Magnaflow x-pipe: http://www.youtube.com/playlist?list...d1qRKK_ChAwmZZ
GT brake upgrade: painted G2 black w/BrakePerformance slotted rotors and Hawk ceramic pads.
2000 Maxima Custom M/F Catback, K&N - SOLD
1972 Lemans 350, 4B - SOLD