well i would get anything that said the car was running all good. but no the sr header will not bolt up to where the catback comes to.

 

the mbrp exhaust SHOULD bolt up to the stock header no problem, but NOT the SR headers. The SR headers are korean spec'ed so they won't fit. You will still need a connection even if you go without a cat.

 

What if I want the cat removed at the headers?
I really don't want the cat(s) at all.

 

Well, I am trying to tell you what happend to me so you don't make the same mistake. If you are going catless get the computer trick. I dont know where to get them. Otherwise you MUST get a cat. Your engine will run like a bat out of hell at first, but then your CEL will come on, and it wont accelerate quite as good, and then your gas tank will be empty by the next day!
hehehe...just listen to someone that spent about $80 extra fixing the mess I made.

 

Ok first, you still going to have to do work on your exhaust if you have a aftermarket header and mbrp exhaust (cat or no-cat). Unless you stick with the stock headers, the mbrp won't fit. its designed for the stock header.

The second o2 sensor can be replaced with a fake simulator with no real performance hit. The first o2 sensor is the one that calculates how mutch oxygen is in your exhaust.

BUT and i really stress that you should get a highflow cat. You won't loose noticable power with a good cat and you also stay legal. Our cars put out a hell of a lot of polution when not using cats. Save your money and do your exhaust the proper way.