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A few years ago when i put on an aftermarket header and larger exhaust muffler, i thought it would help f/e but really wasn't keeping track at the time. Fast forward to 3 weeks ago i was able to get a stock muffler installed for cheap. I also found a guy 2 weekends ago who wanted to trade his stock exhaust manifold for my aftermarket header. It was a pretty long day with the drive and doing the work ourselves, but it was well worth it and i made some nice money from it too.
Right after i did the stock muffler, i noticed a small incline f/e and torque. After i went back to the stock exhaust manifold, i noticed even more of an increase. If my scangauge2 is correct, the switch back to stock will definitely be a nice boost in MPG. I'll know for sure after i fill up tomorrow.
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