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depends on what size of pipes you get, if you keep 2.25 inch pipes till after the cab, then go to 3 inch it'll maintain performance and still sound throaty
One question what is the best gas like 87 octane to 93 octane for performance. Like which is the best performance per price of gas
for fuel where you buy your gas has a bigger impact than octane level for me. up here in canada shell has the best quality fuel and i see a mpg and performance change vs domo or costco gas. I'm not sure where but there is a thred about top quality fuel.
for custom tunes I went with PHP and couldn't be happyer
GL