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The biggest improvements I have seen so far is when I did the exhaust and knock sensor back in April. I had a crack in my stock manifolds and I didn't want to replace them with some thing that is just going to crack again so I installed stainless steel headers. My build and intent on this build is to increase lingetevity of the engine, increase mpg, and gain back my lost power. And when I did the exhaust it made the biggest difference so far. I did the headers and a manga flow muffler. And with that I gained 2-3 mpg. I went from 15-16 mpg on the highway to a solid 18-18.5 mpg on the highway.
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