ordering some obx headers this week for off road use and do not intend to run a cat with this setup. do most obx set up's come with the strait pipe piece to eleminiate the cat? thanks

 

I think you need to get a test pipe as well. but im not 100% sure. I'm getting one to and was planning on having my shop just weld in a strait pipe.

 

ok so i will need to hunt down a piece to connect the headers to the catback which elimnates the cat? thanks

 

I know the OBX header is a copy of the supersprint and supersprint offers a straight pipe where the cat goes for racing...i'd try that

 

since your ordering OBX header, see this thread

https://www.northamericanmotoring.co...d.php?t=140145

and let us know how they look at the manifold flange side.

 

Nope, there is no pipe included to put in place where the cat was.

You are simply left with a 12" gap between where the header ends and the exhaust starts. Just have an exhaust shop weld in a straight pipe in that place. Oh, and run an O2 simulator to get rid of the CEL, cuz that will probably be the next question, lol.

 

haha, already have the CEL figured out.how shoulkd i go about having the shop weld on a strait pipe, bring just the new headers to them with a mesurement?

 

Its gonna sound soooo nasty.

 

It would be idea to install the header and have the catback installed and let them measure the distance and fabricate but if thats not an option then providing them with good measurements is second choice for me.

On another note, I had read commentary that high flow non restrictive cats in no way limit your engine capabilities compared to a straight pipe. You should proabably talk with some of the "racers" here to learn more.

 

I'm lookin forward to it.

 

just wondering did anyone try the Supersprint testpipe on the OBX header?
Also how did you guys weld the O2 sensor on your fabed testpipe?

 

I just got a magnaflow universal cat for it. Only $70 on ebay and I got one with a single bung for the o2 sensor.

 

Payed less than that from Summit. I should have bought the one with two bungs the other could be used with a Wideband O2 for tuning, well next time.

 

last night i installed my new obx headers and staraight pipe connected to my magnaflow catback with no resenator and the sound is a little much. i want to throw the stock cat in, are there any pictures of this? thanks. alsohow much will the cat change the sound? thanks

 

Pics in old OBX threads, I have some on my PC and if you PM your email I will send what I got.

 

Im also fairly certain that ive see info floating around here on supercharged engines liking to run cats.
Provides a better tq curve and all that.
dunno where the thread is im not really too driven to find it right now.

 

put the cat in and your car will be sounding very similar to how it was before you put on the headers. in fact, after hearing the car with the straight pipe you probably won't notice the difference between the oem header and your new obx. it's crazy how different a car sounds with/without a cat on

 

right now im playing around with flanges and mounting and stuff. glad to hear the stock cat will bring it back to a reasonable level.

 

Pictures? look in my gallery, they should still be there.