Leftyb10

Hey guys, new here. Just picked up a 2003 Silverado 5.3L and I was curious what kind of upgrades I could do to get more HP and TQ. Only thing I've done so far is change the gears to 3.73's (mostly due to the bigger tires - 33's) and an Air raid intake tube and high flow filter. I plan on getting LT headers and a cam soon. Just wasn't sure if there was anything else that would be recommended. And what kind of headers and exhaust would you recommend. Thanks in advance.

FFDP

iTrader: (2)

Headers, cam and a tune should get you 50-80hp easy. You're going to want larger injectors too, stock 25lb/hr will be maxed on a cam/headers setup. Upgrade to 8.1L 31lb/hr injectors.

Add a stall converter depending on cam size then pray the 4L60e holds together.

Speed Engineering headers are great, then you have kooks or ARH if you want you want to spend some coin.

Leftyb10

I wasn't planning on going crazy with the cam. This is the one I had my eyes on
Voodoo Hydraulic Roller Cam - GM LS GEN III/IV 262/268 - Lunati Power

FFDP

iTrader: (2)

It would work. TSP also has a very similar cam for a little less money. Shouldn't need a stall with that size cam but adding one wouldn't hurt.

Leftyb10

Yeah, I've looked at TSP. Never used any of their products so I have no experience but I haven't heard very good things from the guys around here.

Leftyb10

And my plan for exhaust (knowing very little about it) was too go with headers into a 3" off road y pipe, 3" piping through a single in dual out black widow muffler

terravast4

iTrader: (25)

texas speed has quality stuff. you can pretty much get everything you need there

FFDP

iTrader: (2)

That exhaust will be next level loud lol, gunna rasp and drone like crazy.

Add a good resonator in there to tame it.

Tig

iTrader: (2)

That exhaust is going to be stupid loud and get old faster than you think you'll enjoy it.

Listen to FFDP, get a resonator to tone it down.

Speed Engineering has some great stuff and quite the variety to at an even better price. Check them out, they have a very nice true dual set up to.

Stall is a great idea to. Definitely increase the fun factor

ezdaar

iTrader: (1)

Should have gone with taller gears, 373 is kaka on 33's.
373 is good on a 27, not a 33.
411 would been better choice and better performance.


Here is a splended idea, give us a budget for your next mod/s, so we can better advise.