Never going to get crazy with the truck. That's what my Camaro is for. Just would like to do some simple things to get a noticeable increase in power and acceleration.

For example, it's well known that a new air lid on an LS1 f-body is one of the best bang for the buck mods you can do. I would also put Mac headers up there among the good proven mods. Of course, for A4 guys, a stall converter is one of the must do mods.

For starters, what's the best intake/airbox mod?

Derrick

P.S. It's a 2003 5.3L Silverado Ext. Cab Z71 4x4 SWB w/ 3.73's.

 

The UPD air intake will be a great first mod. There are dyno proven results of it over the FIPK kit. Headers are also a very nice mod for these motors{ same as your ls1 just smaller} . You can get a Yank truck thruster 3000 stall that will still give you full towing capability. Enjoy your truck and I will warn you, as I am sure others will as well, Once you start modding you wont stop.

 

Your basic intake, exhaust, and tuning make a nice difference. Really depends on budget/hp goals.

HA! I stopped modding my truck...well wait until I get a Duramax.

 

i'd say syn. fluids. air intake, catback

 

So the UPD air intake is kind of the Direct-Flo lid of Trucks, eh? That'll probably be first on my list then. Good suggestions, very good. Thanks for the tip on the stall converter too. I don't know if I'll ever stall my truck but if I do, that sounds like a good one.

So, which headers and cat back seem to be the most proven AND FIT WELL?

Derrick

 

A magna flow catback is gonna be one of the best systems out there, I am switching my chokemaster to magnaflow in a couple of weeks.

 

I just ordered a UPD as well, what are the rwhp / rwtq dyno gains with that addition?

 

You will need to get a hold of Greg the mod { fast4.8} and he has the dyno numbers for it. IF i remember right it dynoed 6rwhp over the k&n FIPK kit. When i installed my UPD I could feel a seat of the pants power gain right off the bat. Throttle response was better and al around it was better. I cant hear it now but you can hear the motor alot more now.