changing muffler...
Thread Starter
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Senior User
Joined: Mar 2009
Posts: 294
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From: metro detroit area...
changing muffler...
i'm thinking of putting flowmaster glass packs on my truck... I assume I can just swap them for my factory mufflers and have no issues but i just want to make sure that with better flow out the back I don't need better flow in the front...
Fleet Owner
Joined: Jan 2008
Posts: 26,898
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From: southern md
Fleet Mechanic
Joined: Feb 2009
Posts: 1,672
Likes: 20
From: Nixa
I have a Flowmaster on my 93 F-250 with the 5.8. My old muffler was rusted out, and I felt a noticable increase in horsepower with the Flowmaster on it. I do have a K&N air filter and a throttle body spacer and the cat. punched out though.
