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  1. #1

    Default More power and speed!!

    Ok guys, I need some advice here. I have added a diablo tune and a cold air intake to my 5.3l. I'm looking for some more performance mods that are fairly cost-effective (not looking to spend 2-3k on a turbo) and will give me more power/speed. A custom tune from Lew is next for me so I know that will help as well. Thanks for any help/ advice!

    2011 Chevrolet Silverado 5.3L LT
    Line-X bed--Line-X Aries Step Bars--Blacked out bow ties--Flowmaster exhaust--Black low-profile UWS toolbox--Weathertec floor mats--5% tint all around--2" leveling kit--Removed front air dam--K&N 77 Series CAI--Diablo Trinity--Diablew custom tune...

  2. #2


    The only way you're going to get more speed, is to change the gear ratios in the trans and diff, or change the internals in the engine, so you can reliably rev it out to higher RPMs.

    If you mean acceleration, then you want to make more low end torque, or lose weight. Or you can change the gears in the trans or diff, too.

    If you don't want to spend the money though (2-3K isn't that much to spend), you're basically not going to get much of anything. Power costs money.

  3. #3

    Enkeiavalanche's Avatar
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    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    did you do Exhaust? As said above if you want more you will spend some $$$ But also keep in mind your MPG's Also if you are going to do this also look in to better brakes,and Sway bars and tires... Are you looking to lift the truck?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  4. #4


    Yeah I am definitely interested in new brakes and a lift but that's a significant upgrade since it's over 2k. Any advice on a new brake system? Also I don't know the advantage of upgrading the sway bars?? I'm thinking a rancho 4" lift btw.

  5. #5


    Look into stainless brake lines and upgrade your brake rotors as far as slotted or slotted and drilled... Summit racing should have all that for around $600... But as far as the power is concerned from where your at its gonna cost money... If your looking for top end speed you need a cam that's gonna bring you into 6500rpm and stay away from any gear ratios above 3.42

    i guess what I'm getting at is if you want speed as far as 1/4 mile or top end?
    2000 single cab short bed 1500 w/ 6.0 vortec maxx swap from a 2006 2500, custom intake, slotted brakes, shorty headers, 8mm wires, electric fan, strait piped, 4.5 inch lift, asp pulleys, true dual through body exhaust, built trans w/ shift kit, custom tune ... 320rwhp

  6. #6


    Keep in mind you have an AFM engine, perfomance parts may not be as plentiful and prices will certainly be higher, maybe not even within your budget.

  7. #7


    I have added a flowmaster exhaust btw. I forgot to mention that. I only replaced the muffler though. Is there an argument to be made for an entirely new true dual system? Would I see real increases from this?

    I am looking at 1/4 mile speed not top end speed btw. Faster off the line is my goal and thanks for all the help!

  8. #8


    That's as simple as putting in a bigger stall converter and changing rear end gears... Your looking at about 3-500 for the stall alone.

  9. #9


    Stay away from drilled/slotted rotors. If you want big brakes, you need to get a kit, and it's going to be around $2500 for a good kit. SSBC and Brembo are generally good, top end stuff. And don't bother with stainless steel flexible lines for your brakes either. Stainless steel hard lines are a good upgrade, but not entirely necessary depending on where you live. If you deal with road salt or live near the ocean with salty sea air, then it's highly recommended. If you don't have to deal with salt, then the stock lines should last long enough. Hard lines can be a pain to replace. Some models of truck/suv require pulling the bed or cab off to change them.

    Stay away from a "true dual" system. It's not worth the money. The only thing you'll get out of a true dual system is the weird burble sound that you might love, and decreased performance. A good dual exit system is fine though. Banks makes some good full systems. Also, don't bother with long tube headers. They're a waste of money in a truck.

    - - - Updated - - -

    Quote Originally Posted by 00chevy53 View Post
    If your looking for top end speed you need a cam that's gonna bring you into 6500rpm and stay away from any gear ratios above 3.42
    You're going to need a lot more than a cam, in an AFM equipped engine, to go 6500+ RPM reliably. An AFM delete will need to be done. That includes at least cam, lifters, springs, keepers, and retainers. It requires pulling the heads. And swapping the valley cover and oil pump would also be highly advisable, as the pump for the AFM engines can create an oil starvation problem when only the cam/valvetrain are swapped.

    Also, the 3.42 rear gear limit is silly for top end speed. A 4.10 rear gear, with 285/45-22 tires, and stock 6L80e gear ratios, will theoretically take a stock AFM 5.3 to 202 MPH at 6000 RPM. There's no way you're going to have a stable ride in a stock bodied truck, going that fast, even if you had enough distance to get to that speed. But a 4.10 will allow one to get up to speed much faster, which is all you need in a truck, because you're not going to go over 150 MPH in a stock bodied truck anyway, and only then in 1/4 mile if you're pushing a lot of power to the wheels, such that you could run a low 9 second quarter mile.

  10. #10


    That's great input. Thanks for the information!

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