Postby slavabon » Tue Apr 24, 2012 4:51 pm
I would suggest replacing restrictive OEM y-pipe with custom unit, that is the best thing you can do while keeping things quiet. There is nothing wrong with stock piping size or with stock muffler for that matter, but that cramped y-pipe is the only bottleneck in the system. I put in the V8 Pathy muffler to eliminate the y-pipe altogether and have 2 separate pipes running into the muffler for better flow. The rear section of the exhaust is stock V6 set up. I'm not sue I gained much MPG improvement - my goal was better flow. My oversized tires are killing any potential mpg gain anyways. Your best way to increase mpgs is to keep your tires properly inflated and staying off the gas pedal. Bully Dog works nice for some folks using gas saving mode when driving...