Russ Giles
TYF Newbie
- Joined
- Feb 3, 2021
- Posts
- 11
- Reaction score
- 14
Installed a Magnaflow Cat Back exhaust with a K&N filter. On the way home after rounding a residential corner and applying minimal throttle I heard aloud grumble (hard to describe) sound under the vehicle like a blockage was happening or the flow was restricted just for a few seconds then gone, very annoying. Doesn't happen under full acceleration or when parked trying to recreate.
happens between only 1,500-2,000 rpms with light throttle only
More regularly now
Clammed the flapper valve full open - no change
Turned off v4 mode and did a Diablo 87 octane tune - no change
Took it to my muffler guy, who replicated the sound on a test drive but says it is not the exhaust. plugged any obvious, small leaks
Nothing loose, nothing touching the heat shields, no obvious loose pieces under the vehicle
Can't figure this one out. Motor mounts? Harmonics? what else can it be?
happens between only 1,500-2,000 rpms with light throttle only
More regularly now
Clammed the flapper valve full open - no change
Turned off v4 mode and did a Diablo 87 octane tune - no change
Took it to my muffler guy, who replicated the sound on a test drive but says it is not the exhaust. plugged any obvious, small leaks
Nothing loose, nothing touching the heat shields, no obvious loose pieces under the vehicle
Can't figure this one out. Motor mounts? Harmonics? what else can it be?