Hey Guys. My Dad just bought a 2003 GMC extended cab 5.3 truck. What are some easy mods I could do to it for him to get it running a little quicker? Not looking for huge power, just maybe a little gas milage and enough power so he can be quicker than his work buddies with the same type of truck, lol.

Thanks!!

 

Do you want to know th best free modd's? Or the best bolt on's?

 

Some easy modifications are:
1.Flowmaster muffler
2.K&N filter
3.160 degree thermostat
4.Throttle body spacer
5.Hypertech Power Programmer III

 

UPD intake and some better exaust would give him plenty of power to get by his work buddies. the hypertech would be great too, and plenty of people are unloading them for cheap now so just look around. and you could do the free mods too.

don't get a throttle body spacer though, they aren't worth a crap on the ls1 based motors.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jhonn:
<strong>Some easy modifications are:
1.Flowmaster muffler
2.K&N filter
3.160 degree thermostat
4.Throttle body spacer
5.Hypertech Power Programmer III</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">here is my list, a little more general

1. muffler - depends on your preferences
2. air intake such as k&n gen2 or upd (good for gas mileage)
3. computer tuning, there are some better tuning devices out now that produce better results than hpp3 (superchips, diablo, etc...)
4. 6.0L engine swap w/ S2 heads/cam <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

after you have those you have all the basic bolt ons. then you start getting into the pricey stuff

honestly i wouldn't even waste my money on the throttle body spacer. I don't think i have ever heard of anyone who actually got gains from one. only an annoying whistle...

hope this helps <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />

bryan

<small>[ December 01, 2002, 10:31 PM: Message edited by: really slow truck ]</small>

 

hmm....

Some easy modifications are:
1.Hypertech Power Programmer III
2.Flowmaster muffler
3.K&N filter
4.160 degree thermostat
.
.
.
.
.
122. Throttle body spacer

Ahh, there we go <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

Thanks everyone!! Has anyone ever tried the MAC cold air kits? We carry them at work now and they look like a pretty cool piece.

What would be the free mods since I am not real familiar with ls1 motors?

 

the factory already sucks "cold" air from the fender. With a stock motor that'l help as much as pin striping

 

pen striping gives 5-10rwhp? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

i dont know anything about the MAC cold air kits, but any intake will give a gain on these unless you REALLY screwed it up. the only reason i mentioned the k&n gen2 and the upd is because they have been proven. the MAC may turn out to be good, i just dunno

u could always try a before/after dyno <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

Somthing to consider since the truck is an 03, i'd check all the part's to make shure they dont void factory warranty, wouldnt want somthing to go bad and warranty not cover, cause the dealership said your after market parts voided the warranty! Other than that my suggestions would be=
1.UPD intake
2.good flowing muffler
3.NGK TR55 pugs
4.Keep regular maintenece up (especially the tranny!)
5. O yeah and a good grade-brand of gas.
Check to see if these wont void the factory warranty . Then have fun in the work truck!
<img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />