Lionwood
Member
Hi guys, I have an 2001 Expy with the 5.4 and a mechanic friend of mine suggested replacing my muffler with a Glasspack for better mpg. The thought of it does sound good but I'm wondering if I would lose any performance with a straight through muffler ? I'm not worried about the sound as I'm sure the extra grown would sound fine since it still has all the cats and resonator. I'm thinking of doing the gotts mod to go with it. Does anyone have thoughts on this ?