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Thread: Hp Question

  1. #1
    Sr. Apprentice
    Join Date
    Mar 2009
    East Greenville Pa

    Default Hp Question

    How much hp gain on a 5.3 engine can i expect to see with long tube headers, cold air intake, a true dual exhaust and a custom tune by diablo lew

  2. #2


    its really hard to guess man. my old mustang i had i did bbk shortys bbk cai. and tuned it and only got 23hp. dynoed out at 286.4hp 312ft lb tq when they were done. thats with a lil more fuel from my 176lph pump. headers are usually the big difference maker. torque was from 298 ish i think.

  3. #3
    Sr. Apprentice
    Join Date
    Mar 2009
    East Greenville Pa


    ok thanks for replying guess i will find out when i get it all done.

  4. #4


    If i had to guess id say rwhp prob 30-45 on a good day. i do know with a nelsons tune and a cam you can push close to 100 hp over a stock application. honestly so far my two biggest " noticable" mods have been my cam and my tune. more so the tune for now tho because my cam needs a stall
    2004 gmc sierra ext z71 5.3
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

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