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I have a 2011 SL flex fuel with just about 230k miles. My truck runs great but within the last year I've added a 3" rough country lift with Bilstein shocks and 34.5" Patagonia milestar mud tires. My truck has been feeling a lot slower now and I was wondering if I should put some aftermarket headers on it or just get a bully dog tuner.
 

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Would re gearing be an easy thing to do?
It’s not horrible but a lot of people opt to have a shop do it instead. Given you basically have 35s, I’d recommend at least 3.73 gears; that way when you step on the gas, it’ll actually respond!
 

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Have you done new plugs and the proper maintenance on the truck? Headers will require UpRev tuning, and a re-gear will not be cheap.
 

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Change them by miles, not by years. Be sure to use OEM, NGK plugs for best service.
 

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NGK 98376 DILFR5A-11D Laser Iridium Plug
 

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Headers help the mid range a lot. Are you looking for more response on the throttle or low end? Also which fuel are you using?
 

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You need headers and UpRev. Best bang for the buck.
 

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Contact Nightowl, a site vendor for both items. They are good folks.
 

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Cigarillo is right. When you went to the taller tires you effectively changed your rear end ratio. Not sure where you started, these trucks came with 2.94 or 3.36 gears depending on package, and the stock tire size was optimized for the rear end. If you're looking to get back to where it was, you'll need to step up your gearing accordingly. While a fresh tune up & maybe a computer tweak may not be a bad idea, you're not going to be happy with your results with those big tires.
 
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