When I re-did the exhaust on my 2.6 Trooper, I put on a free-flowing 2.25 system, cat back. Everything ahead of the cat is original. My buttometer tells me that I have slightly better response, better power.

If we're lucky somebody might come in with an actually technical answer.


1989 Trooper, 2.6
1989 Trooper, 2.8
1992 Ford F-350, 7.3

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