2005-2009 Ford Mustang GT 4.6L Borla S-Type Axle-back Exhaust System | 11750

After listening to the Borla S types, they most definitely provide that deep throaty sound I've been searching for in which for the most part I've been very pleased with them where their loud when you want them, but not overbearing or over the top.. The bad news is, there is a noticeable drone to them between 1500-2000 RPM when under load, during acceleration under 50 MPH.. The good news however, is once I'm above 55 MPH on the highway while cruising, there is no noticeable drone whatsoever in 5th gear at 2000 RPM and above.. In addition, Borla also confirmed that once the axle backs build up enough filament/carbon approx after 300-500 miles, the carbon build up should reduce the amount of drone.. There were also no fitment issues, as both mufflers lined up perfectly with the only exception of having to cut approx 1/4 inch off the driver's side hanger rod, as it wasn't clearing the frame rail at the rear valance.. Other than that, no other adjustments were necessary.. That being said, from my personal experience, the drone isn't nearly as bad as from other reviews I've read concerning the drone as being so unbearable.. Perhaps it's just me or my hearing just isn't quite as sensitive to drone as others have reported about the Borla S types.. All I can say is, the drone is very livable and isn't really heavy nor obnoxious at all IMHO.. In the meantime, hope this review of the Borla S type axle back exhaust may be useful to anyone who might be considering them.. -Rocky