Unless you think you have to spend a bunch of cash to extract every hp possible a tune is all you need. The other parts make things a bit more consistent and work better under extreme heat and wfo conditions. But the tune will get you 90% there for 25% of the cost
not correct. When i filled my 6.2 the miles to empty depending on the season was always 350-400. My 18 is always over 500. I drive lots of city , prob 60 miles a day. The 3.5 does way better than the 6.2
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