I really do try and do my research before asking or posting, and it looks like both Seafoam and MMO are both highly not-recommended on these forums for the 5.4
so I did more research and found these videos from someone who did incredible research and tests on both and the results blew me away...
I’m considered a full cat back exhaust
however, quietest and tame as possible with zero drone.
Basically something just a step above stock. I don’t need or want to shake the block, something that’s somewhat noticeable and has no highway drone.
Any recommendations ? I read through some forums...
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