serodgers66
Member
I recently replaced my two piece headers with a stock manifold on the driver's side and a 90's magnum manifold on the passengers side. The headers rattled and leaked constantly and were a little too loud for my tastes. The unintended consequence was that I picked up a very pronounced drone when stopped at a light with rpm's between 750 and 1000. Like unbearably uncomfortable. Not necessary loud but it was like sitting inside a bass drum. I took it to a transmission shop thinking it may be my torque converter but everything checked out ok. So I chalked it up to a harmonic frequency issue. The exhaust is a 2.25" X exhaust that feeds into two Dynomax Turbo Mufflers that exit right before the rear axle. Before I sunk unneccesary $$$ trying to resolve the drone, I decided to pick up two Thrush Welded mufflers at the local parts store. I installed them and no change...actually, a little worse. I was in the middle of changing back to the turbos when I thought, "I wonder what it sounds like with one of each? Will the difference in backpressure solve the drone?" So I only swapped one Thrush for a turbo and took it for a spin. To my surprise, the drone was reduced considerably!! Not completely gone, but enough of an improvement that I can enjoy driving the car again. Just thought I'd share in case someone is battling something similar....
