new Chevy owner and first time member/posting....
Truck: 2015 5.3L with Borla S-type, resinator and flapper removed....
I have had the exhaust now for almost 2 weeks and CANNOT take the v4 Drone, whether local roads or highway and determined this quickly. Come to find out the Borla S-Type part number is for a 2-1/2" single in 2-1/2" single out.
Could the helicopter/drone noise be from the 2-1/2" Borla restricting flow ?
I need to make a change and dont care if i have to get the GM-Borla kit, i cant stand this fluttering sound, driving me crazy.