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4K views 12 replies 2 participants last post by  Hunter_3 
#1 ·
So my warm up cat is on its way out.. hopefully it lasts until Christmas so i dont have to end up paying for a bunch of stuff. I have been looking around at some different options and came across these two products. Yes, i know the difference between the two, and the extra work needed for the OBX flex pipe addition. thats the physical stuff. What will be the difference when it comes to noise/performance between these two. Im just trying to decide which one i want.

http://www.sparktecmotorsports.com/...=91571116997&gclid=CKistpGzlsICFQGDaQodHlgAwA


http://www.autoanything.com/exhausts-mufflers/73A6725A0A0.aspx


and just FYI, i have a 2.3L 2004 mz3s
 
#3 ·
You know it's funny that you say that because I just trusted what the shop said. But earlier today I thought... Wait a minute:screwy:?? So now I'm looking into the O2 sensors. I was looking earlier today and I see 4 wire and 5 wire and wideband and all of these different options. If I'm replacing the two sensors that surround the warm up cat, which ones do I need?
 
#4 ·
1, there is no "warmup cat"
2, the only one that reads the cat is the downstream one (unless you have the Cali PZEV which has 3, in which case the latter 2 downstream)
3, it's been cold recently, if you're get a 0421 code, it's... not really an issue, it's more or less because it's colder than normal.
 
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