Hi, I installed the magnafloww stanles steel axle without muffler, and when I cruise on 160 km or higher, a noisy sound comes & goes, I checked with the dealer, and they said its from the fuel pump, and it sounds normal.
But I dont think this is right, any help in this subject?
without mufflers, I don't think you'd be able to hear your fuel pump. It could be a lot of things...heat shield rattle, the pipes hitting the tunnel brace or just the fact that a muffler delete is noisy. Without hearing it, it's kinda hard to tell. I'm surprised your dealer didn't just blame your aftermarket exhaust.
James 1:25 Ordered from Faulkner Chevy #NKCF02 1100 5/8/9 2000, 3300 7/16/9 TPW 7/20,GOT MY (low) VIN! 4000 7/24/9 ,Picked up 8/7/9!!! Signed Litho #45. Car signed by FBodfather 2011. Service: Jennings Chevy in PA. We don't "drift", kiddies... we POWER SLIDE! MOTM/COTM Sept 2012 Pro Patria Vigilans. Click the pic.. I don't tolerate fools.
Texas Speed 1 7/8 LT Headers, Texas Speed High Flow Cats, Magnaflow 3 inch Cat Back Exhaust, SNL V2 Comp CAM, Texas Speed Underdrive Pully, G5CR CAI, Hurst Short Throw Shifter, JetFlo Mass Air Sensor
My car is exactly that; No one has to like it but me!
As mentioned, its most likely a resonance formed at certain rpms (drone). You can get this on an M6 or A6 with a more aggressive exhaust setup, but the problem can be compounded on a A6 with the addition of AFM kicking in and out.