How much power will my truck make after these mods?

[Jeremiah_Yukon02]

Ok so I have a 2002 GMC Yukon 5.3 LM7, I think the stock power rating is 285?, Where do you think I'll be with a few bolt ons like, Shorty Headers, High Flow cats, catback exhaust and a blackbear tune?


145k Miles.

 

[Joseph Garcia]

Are you staying on 87 octane? If so, my non-professional guess would be up to 25 additional HP.

Other members on this Forum that are much more knowledgeable than me will chime in.

 

[Mudsport96]

Shorty headers.. 4 to 6 hp ( dyno proven compared to manifolds)
cats i think negligible as properly functioning stocks should flow more than a 5.3 can use.
Catback would be the most beneficial with a tune.
I say 20 at best.
Header dyno results manifolds vs shorties vs long tubes

 

[Tonyv__]

Ok so I have a 2002 GMC Yukon 5.3 LM7, I think the stock power rating is 285?, Where do you think I'll be with a few bolt ons like, Shorty Headers, High Flow cats, catback exhaust and a blackbear tune?


145k Miles.

slap a cam in there and you’ll really wake the engine up.

 

[Jeremiah_Yukon02]

slap a cam in there and you’ll really wake the engine up.

If I'm gonna do a cam something I'm worried about is reliability and also paired with all those mods plus the mild cam how much hp do you think I'll be making?

 

[Mudsport96]

If I'm gonna do a cam something I'm worried about is reliability and also paired with all those mods plus the mild cam how much hp do you think I'll be making?

Look up Richard Holdener on youtube. He has hundreds of dyno videos.

 

[OR VietVet]

I recommend making sure the engine is ready for the HP pop up. Do a compression test to verify all is good. I recently had a free BBP tune done and it really woke up my engine when accel and the transmission shifts are firmer but I had done a recent compression test during my build thread and knew all was good. You could also do these upgrades in stages.

 

[Tonyv__]

If I'm gonna do a cam something I'm worried about is reliability and also paired with all those mods plus the mild cam how much hp do you think I'll be making?

I have no comment on the HP question because I don’t have an answer for you. But I suggest the cam because all the mods you listed will get you nothing more than a screaming truck with barely any increase in performance

 

[tom3]

Son had an 06 Siverado with your same drivetrain. He put a cold air intake on it that probably gave no real power increase but really had a nice sound. Premium gas and a tune of some sort did make some more power by the seat of the pants dyno.

 

[OR VietVet]

Something else to consider thru all this. As you continue to do this horsepower increase and if you go even further, you need to make sure some other systems are up to *s*n*u*f*f* for the increase. First in line is brakes, you can go fast but you gotta STOP. Next is steering and suspension, so that the handling can be safe during the HP runs. Make sure the cooling system is clean and flowing great and being cooled properly. Is the transmission in great shape and do you know when the last time it was serviced and what was done during that servicing. Rear diff comes to mind. Fluid condition/age and gear lash and sight inspection of the guts.

What in the name of the Wide Wide World of Sports is going on here? The word s*n*u*f*f gets the asterisk treatment?????? C'mon man!!!!!!!!!!!