Quote:
Originally Posted by wumpus
On the other hand, has anybody seen real gains from reducing exaust backpressure?
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This is purely anecdotal, because I don't have good records before/after.
However adding a Dynomax "cat back" to my Jeep 4.0 appears to have
hurt the mileage.
Since it is considerably louder, I'm assuming it has less backpressure.
If I had a do-over, I'd go with stock or equivalent muffler.