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Looking to upgrade engine, what will give me significant HP gains without supercharging? Please comment recommendations!
 

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2019 Jeep Grand Cherokee Trailhawk
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What do you consider significant gains? Nothing you do will give you more than 10-20hp on the Hemi. Goes like that for any vehicle really. You want big power you gotta have big money.
 

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The 6.4 is already making most of its available power from the factory. There really aren't any significant gains to be found without forced induction or nitrous. Some folks have managed a fair gain with intake, exhaust (including headers and de-cat), and most importantly, a tune (Diablosport being the most common).

Your best bet for real horsepower gian is to save your money and get a Trackhawk...FYI, people that have done both still recommend getting a Trackhawk over supercharging an SRT.
 
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