Doesnt the rear o2 help make sure your cars running efficiently? When u get a tune to delete them so u dont throw a code with test pipe doesnt that affect the way your car runs?

 

The only purpose of the secondary O2 sensor is to make sure your cat is working properly. Coding it out is simply a way to pass emissions testing if your cat actually IS bad, or if you swapped it out for a test pipe.

 

Is there a DIY for coding out the rear O2 sensors or do you just have to send it somewhere to get it coded? I'm getting tired of seeing the CEL light on my dash because of them. I did a quick search but didn't come up with much.

 

You won't be able to do it. I know about a handful of guys who are handy enough with Vag com, Maestro, and Motoza to do it themselves. Odds are you're going to have to get it done custom from a place like GIAC or Unitronic

 

Ill just get it done by ST with my tune. How are those headers k04/ko3 flange manifolds and the test pipes listed on ebay for our cars? I mean you cant really go wrong with piping right?

 

They'll be able to do it for ya. The eBay test pipes are fine. Good fitment, nice thick flanges, good penetration on the welds. The tubular manifolds are garbage though. They're usually Chinese and made of thin walled, poor quality stainless. The welds are still ok on them but the tubing will eventually crack. There's an odd coupla people who get good ones, but odds are you'll be disappointed.

If you want to run a high flow manifold for a K03/4, you can either port out a stock mani or go with a log style high flow manifold like the one from Frankenturbo. PSI also makes a decent manifold but they run very hot

 

I want a header style mani that doesnt crack =(. Edit: actually log styles nice too. Know of any i can buy that you e heard good things about? Any point in me porting stock intake mani or getting a new intake mani?

 

This is supposed to be a decent manifold, though I only know of one guy who has one. He's on the zine and bought a bunch of **** from that company to see if it was any good. However, if you do a little research on the grade of stainless they use in that mani, its only good up to about 900*F. Like I said, odds are its going to crack eventually.

Even the stock turbo could benefit from a larger manifold, but I can't guarantee you're going to see a ton of results for the amount of effort you put into it. I've heard good things about the manifold that ships with Frankenturbos, so if you can get your hands on one I'd go that route. I don't think he sells the manifolds separately but it couldn't hurt to email him I suppose.

 

Ok thank you. I'll look into that.

 

Thought I'd bump this for more info about that guy on the zine I mentioned in post #8. Here's the thread I was talking about:

http://www.audizine.com/forum/showth...wer-SSAC-parts

Confirms what everyone has been saying for years about Chinese eBay turbos...