I admit I know nothing about exhaust I dont even know where to start I have a 2013 qc with a vararam, 87mm PTB and tuner what is the best option to help with MPG?
go underneath truck and follow the exhaust pipe from the exhaust manifolds, where they meet is the Y pipe.. dodge chose to pinch the pipe together to get it to fit a single pipe, this is the bottleneck of the exhaust. an aftermarket Y will merge the pipes where there isn't such a restriction...
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