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Thread: HP Increases for 4.7L Flex Fuel

  1. #11
    Lifetime Member Getting Dirty Sal-XK's Avatar
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    I think you need to figure out where else this engine is being used and cross reference the parts you need that might help.

  2. #12
    Lifetime Member Getting Dirty strokeZ's Avatar
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    It was used in the Durango's for sure and quite likely the Aspen. I was just looking at headers yesterday but found nothing specific. So now I am thinking bigger throttle body, headers and maybe free flow cats. For the size of the displacement, there should be a decent amount of power left in it. I might call a few performance shops to see what they might have done or if they have any other options. If I could eek out 330 HP w similar torque gain I would be a happy guy......
    2012 Jeep JKU Rubicon - 4-1/2" AEV lift w 35" Toyo's

    03 BMW Z4 2.5i ESS Stage 2 Supercharged, Custom Suspension, Stebro Exhaust, Hamann Side Skirts

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  3. #13
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    I just searched the net for headers and it looks like were out of luck. It seems like there wasnt enough room in a lot of the engine compartments that the 4.7 L came in.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

  4. #14
    Lifetime Member Getting Dirty strokeZ's Avatar
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    That is exactly what led me to research a supercharger 07JeepXK. Short of swapping out the cam at a hardcore shop, there seems to be little that can be done from a bolt on application standpoint.
    2012 Jeep JKU Rubicon - 4-1/2" AEV lift w 35" Toyo's

    03 BMW Z4 2.5i ESS Stage 2 Supercharged, Custom Suspension, Stebro Exhaust, Hamann Side Skirts

    85 BMW 535is Lowering springs, bilstein sport shocks, extra attitude

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