How to Increase Horsepower & Torque for Your GMC Sierra


Top Products For Adding Horsepower and Torque

Air Intake1. Air Intake or High-Flow Replacement Filter

  • Powered by cotton-gauze filter mediums that can be washed and reused for life
  • Parabolic diverter chamber increases air velocity while smoothing out flow
  • Include instructions and hardware for installation made easy

Throttle Body Spacer

2. Throttle Body Spacer (for naturally aspirated models only)

A throttle body spacer is a great way to boost horsepower and torque without attracting too much attention. Not only does it do away with obnoxious whistling or engine noise, but a unique, helical construction creates turbulence for a high-velocity spin to provide a superior atomized mixture of air and fuel.

  • Constructed from either aircraft-grade billet aluminum or a glass-filled nylon composite
  • Channels air/fuel mixture into your combustion chamber for bigger kick and better mileage
  • Durably crafted to last years under intense conditions

Cat Back Exhaust

3. Cat Back Exhaust

Your GMC Sierra has it all – the rough-and-ready look, the living-legend status and the ability to deliver on all fronts. Best you make sure it sounds like the backcountry beast it is with a high-functioning cat back exhaust. At AutoAnything, you can restore your truck’s sound with a horsepower and torque-enhancing exhaust built just for you without having to worry about quality or breaking the bank.

  • Mandrel-bent from aluminized or stainless steel to reduce the bane of backpressure
  • Available in single-, dual-, rear- and side-exit configurations to suit your Sierra
  • Comes with all the mufflers, tubes, tips & hardware you need to get the job done

Performance Tuner4. Tuner

  • Modifies your Sierra’s computer and adjusts your speed limiter, tire size and rev limit
  • Includes connector, USB cables (varying sizes), software installation disc and more
  • Free online updates available through your PC.

Intercooler5. Upgraded Intercooler (Diesel)

  • Fully equipped with necessary pipes, hoses, boots, hardware and T-bolt clamps
  • Larger-than-stock core area optimizes transference of heat for better cooling
  • Intercooler kits include every tool you require for a painless install

JBA Cat4ward Headers6. Headers (Gas) or High-Flow Downpipe (Diesel)

  • Headers and downpipes are both mandrel-bent to fit in place of your OEM parts
  • Deliver deeper, hair-raising exhaust notes
  • Hardware included for bolt-on installation

Throttle Bodies7. Larger Throttle Body

  • Innovative design improves air velocity to your engine’s intake manifold
  • Crafted from CNC-machined aluminum to last the long haul
  • Direct factory fitment – needs no modification


8. Supercharger (Gas) or Upgraded Turbo (Diesel)

No matter whether your Sierra runs – on gasoline or diesel – it needs the right parts to make a molehill of that next mountain. At AutoAnything, you can find the aftermarket supercharger for your gas-guzzler and an upgraded turbocharger for your diesel dog for a shockwave of RPM-spanning power.

  • Intercooler airflow technology for superchargers keeps temperatures low
  • Ported shroud compressor for diesel rigs controls compressor surge and turbo bark
  • Durably fashioned to survive any adventure

Methanol Injection

9. Meth Injection (Diesel)

They say true power comes from within – and in the case of your mighty GMC Sierra, we’re not just talking about its engine. With a performance meth injection kit installed, you don’t have to worry about imploding your power plant by running harder for longer – that super-cool water/methanol injection more than takes care of that. Even better, you’ll experience lower EGTs by triple-digit margins and better fuel economy than ever before.

  • Catalyzes combustion and keeps temperatures down
  • Increases air-charge densities by up to 5 psi
  • Cuts down on tailpipe emissions in a big way


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Mike Cote
I'm on off-road enthusiast behind the wheel of a perpetual project 4x4 Tacoma. I like to play in the rocks, but won't shy away from fast runs through the desert. My passion came from my dad whose had me in and around cars for as long as I can remember.


  1. I have a 1999 GMC 2500 sle with a 6ltr I pull a 28ft jayco 5th wheel gross wieght is about 8000 .Can I tune-up for more power

    • Hey Keith,

      The good news is you’re spoiled for choice here! My recommendation would be to start with the classics. Intake, exhaust, tuner, and headers. There are tons and tons of parts available for these, so you can go about as deep down this rabbit hole as you want.

      As for brands, K&N, Volant, and aFe are great for intakes, Magnaflow, Flowmaster, and Borla can always be trusted for exhaust, Bully Dog and Edge for tuners are great, and for headers, Kooks, JBA, and Pacesetter are great options.

      Hope this helps get you started! If you need more specific recommendations, let me know!


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