More hp

Asked by Mar 06, 2018 at 08:15 PM about the 2003 GMC Sierra 1500

Question type: Car Customization

I have a 03 gmc sierra 1500 ext cab 4x4 with a 5.3l
v8. I want it to have 100 more hp how can I do
that? Also would like to make my rear end way
stronger than the stock version. Please would love
any advice.

2 Answers


Change the rear axle to one out of a 2500. To get 100 hp look for a super/turbo charger kit.

1 people found this helpful.

F_O_R is, as usual, correct. You can use the rear end out of a 2500 and be just fine well up into the high HP range. However, the tougher...and more expensive....part is adding 100HP. That is no easy feat and will DEFINITELY require forced induction. If anyone comes in here and says "Just slap a huge shot of nitrous on it", don't. Unless, of course, you have the cash to replace the motor. 100HP means you're probably looking at an intercooled Vortec supercharger kit. How is your budget for this? With the supercharger, supporting mods (fuel injectors, fuel pump, belts, all the little bells and whistles required) and a good dyno tune you're looking at spending around $10k, no joke and that's a minimum. To get the most out of the blower, you'll need to get long tube headers, an aftermarket intake, and likely new gears as I don't know your ratio but you'll want 3.73's at a minimum. Budget $15k and you should be good. Just keep in mind....for $15k, you can get a car that can haul butt and drive that when you want while still having your truck as a daily driver. Car examples that can be had under $15k include: 1998 - 2002 Camaro Z28 and SS models, 1999 and 2001 SVT Cobra models, some 1998 - 2004 Corvettes, 1998 - 2002 Trans Am WS6 cars.....just depends what you want. Just throwing some options out there.

Your Answer:

GMC Sierra 1500 Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Glenn Clingenpeel
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,386 Great Deals out of 177,454 listings starting at $1,900
Used Ford F-150
3,674 Great Deals out of 212,663 listings starting at $160
Used GMC Sierra 2500HD
170 Great Deals out of 14,808 listings starting at $2,999
Used Chevrolet Silverado 2500HD
371 Great Deals out of 30,274 listings starting at $2,950
Used Toyota Tundra
729 Great Deals out of 37,779 listings starting at $1,995
Used Dodge Ram 1500
318 Great Deals out of 8,452 listings starting at $1,495
Used Chevrolet Tahoe
794 Great Deals out of 40,163 listings starting at $1,025
Used Toyota Tacoma
704 Great Deals out of 51,589 listings starting at $850
Used Ford F-250 Super Duty
564 Great Deals out of 45,284 listings starting at $2,200
Used GMC Yukon
502 Great Deals out of 23,629 listings starting at $1,800
Used Chevrolet Colorado
406 Great Deals out of 39,548 listings starting at $995
Used GMC Canyon
137 Great Deals out of 13,422 listings starting at $2,495
Used Chevrolet Camaro
688 Great Deals out of 28,383 listings starting at $1
Used Jeep Grand Cherokee
1,201 Great Deals out of 90,011 listings starting at $999

Used Cars for Sale

2019 GMC Sierra 1500 For Sale
9,923 listings starting at $37,723
2018 GMC Sierra 1500 For Sale
61 Great Deals out of 32,002 listings starting at $21,490
2017 GMC Sierra 1500 For Sale
135 Great Deals out of 4,512 listings starting at $16,499
2016 GMC Sierra 1500 For Sale
117 Great Deals out of 3,492 listings starting at $15,980
2015 GMC Sierra 1500 For Sale
184 Great Deals out of 5,366 listings starting at $12,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.