Same OBDII test here in Jersey, and my cats are ... I always pass, knock on wood. As long as there aren't any codes and all of the necessary monitors have run (readiness tests), you're golden

 

just a note, i still ain't got any codes without a retune.

granted, i've been TDY for a month, so it was only driving from the end of Jan to the end of Feb, but it's still "check ready" today

 

alright... i take that back. just got a CEL today. 5 weeks of driving & it just now came on. i ain't had it read, but i'm willing to bet it's the cat codes

 

You must have jinxed yourself yesterday, huh?

 

has anyone noticed MPG gain? What are tuning options for these trucks i have a 99 4.8

 

so... um... yeah...
it cleared itself the next day, so i don't know what code it was throwing

 

A tune from a sponsor or a dyno tune are your best bet

 

A code reader/scanner should still be able to retrieve the code. I'd wanna know what it was, if I could.

Agree 100%. Lots of people say their new headers (of any brand) don't "need" tuning for them, but to get any advantage from them (whether they be $300 Ebays or $1200 Stainless Works) you really need to tune for them. Personally, I got 2-3 MPG's depending on driving style for that particular tank of gas, lol.

 

Hey guys, I just assumed this and haven't checked yet, does the Y pipe end up roughly in the same place that the stock one does? I'm trying to get everything that's going to be from the Y back put together so I can just throw it on and put the clamps/hangers on.

 

Yeah it's pretty much the same man.