I recently added 2 of these http://www.ebay.com/itm/2-5-x-18-Long-Vibrant-Performance-Exhaust-Resonator-Stainless-Steel-1793-/310767570550?pt=Motors_Car_Truck_Parts_Accessories&hash=item485b30ce76&vxp=mtr to get rid of my exhaust drone after replacing my offroad h with an x. So far, its doing a...