im trying to pick up a set of shorty headers for my 4.8 4x4 to add to the no muffler, dual exhaust w/ X pipe setup im running. i seem to run into the question of wether i have A.I.R & EGR . can someone tell me what that means and how the best way to detect if i have either or neither on my truck?

 

year of the truck?

 

its a 1999

 

You should have EGR, may or may not have AIR. EGR will be on the passenger's side exhaust manifold, there will be a pipe going from the ex manifold to an electronic valve, to the intake. If it has AIR, there will be an AIR pump with more ports going to both manifolds I believe...if you only see the EGR on the pass side, that's all you have.

FWIW, I wouldn't waste my money on shorties, I'd go for a good set of long tubes. I have shorties myself and the gains are very little to none. I'm saving up for some LT's.

 

as much as id luv to run long tubes ive been told that id have clearence issues because of it being a 4x4. are there certain long tube headers that would actually fit?

 

I am willing to bet you have AIR and EGR on that truck.

 

My 99 doesn't have AIR...I think it depends if it has Cal or Fed emissions? I haven't seen too many NBS trucks with AIR personally, might have to do with being East Coast.

ASM's will fit, but require minor cutting and welding of the y-pipe. The Dynatech system will also bolt right in, and I've heard that the StainlessWorks will fit if you delete the EGR and AIR (if equipped).

 

what about an 01 z71 5.3l?

 

i got the dynatech and mine is 2K. The first install my front DS hit the collector. and took a nice chunk out of it. Dynatech replaced it (they don't cover labor...as who does?) and with a wood 2X4 as a pry bar I shoved it against the outer wall and I'll tell ya...it's F-ing close, but it's been golden since. It sucks...the clearance, but from what I gather, you'll be happier with LT's.

I don't have AIR either. HAD EGR...trashed that recently.

 

Same as the 99...ASM and Dynatech definitely...and I'm hoping StainlessWorks (those are the one's I want)