very cool , thanks for the post

 

yeh no problem, my post wasn't clear at all

my pleasure Bob

 

Thanks for the info Here's what I got:
http://www.hpcoatings.com/services/pricelist.aspx

Looks like it would cost about $150-200...

 

The OBX is all stainless steel, pipe is 16 gauge, most SS are, whereas the better mild steel headers are 14 Ga., the flange is actually thicker than the OEM flange but I didn't measure that just an observation.
I just installed mine on Sunday, all my bolts fit with no interference with the runners. I had slightly chamfered all bolt holes on outside face of flange.
From past experience this solves the PITA problem of getting the header bolts started when the runners are close.
I had posted pictures of the OBX header before and after cleaning up the ports then having it Jet-Hot coated inside and out.
Installed an OBD2 compliant Magnaflow CAT 2.5" in/out connected to a 2.5 inch Magnaflow CAT back.
This morning I got on it a bit, man is the mid range improved, really woke it up!
Backpressure, who needs backpressure...

 

I'm really between the OBX and Megan Headers because of the price. Has the problems with bolt holes lining up with the OBX been fixed? Or is that more of an indepent problem varying from header to header?

About backpressure, Webb doesn't seem to think it's necessary with his 3" Exhaust which makes more HP AND TQ than any exhaust on the market, both closed AND open valve. Not to mention the future release of a Header with a 3" Downpipe... As for me, I care more about Top End power than Low End so I couldn't care less for backpressure, hehe...

 

To make the engine work efficiently while on boost, you do not want any back pressure.

 

my bolts went in perfectly

 

I was just being facetious about the Backpressure bit.

 

There is no problem with the flange drilling of the holes, they are spot on.
You can check it with a new OEM header gasket laid up against the flange.
The MINI sure has MINI exhaust ports so the header provides a generous step to prevent reversion.

 

I'm not so sure about that. Take a look inside you intake manifold and report back on what you see. Maybe your nod symbol means the opposite of what you wrote. I'm not too up to speed on those characters.

 

I'm talking about exhaust ports and headers here wasn't that clear?
Why don't you start a new thread if you want to talk about intake ports and report back here. How about that!

 

relax norm, he wasn't being rude....

 

Sorry, I think you took that the wrong way. No harm intended here. They are related is what I was trying to say. The exhaust actually can travel up past the intake port and into the intake manifold.

 

dmh, Sorry for my snap response.
Yes I know that from first hand experience with carbureted air cooled VW engines.
It would amaze some to know that reversion without a balance port or tube between intake ports depending on crank shaft configuration and Cam shaft overlap will cause a gas cloud up to 4 inches above the top just (remembered it's termed fuel standoff) of a single/2 barrel carb feeding both cylinder banks, or twin single barrel carbs each feeding 2 cylinders each or Dell'Orto/Weber carbs with one Venturi per cylinder.
Also that you want to have a step on the intake, but in this location the intake port must be larger than the intake runner. Reversion pulses pass all the way into the intake manifold. These fundamentals apply to all piston engines regardless of aspiration technique.
So now I'm way off topic.

 

my obx is sweet!

 

Me too

 

So...since OBX is cat-less, has anyone run without the cat and what do you do with the post cat O2 sensor? Is it even possible to run without a cat?

 

you need to do some welding to make a spacer where the cat would go, and you need a flange to get it to bolt up to the stock cat-back. You need something to simulate the load on the rear 02 heater circuit, and something to fool the ECU into thinking that the cat is working.....

But I'd say that going catless is only appropriate for a track car..... And that the thrown code won't change how the car runs....

Matt

 

I agree track is one thing otherwise keep it green!

 

Yes...of course of course...I will also obey the speed limit and never waste fuel with lead foot accelerations...of course...

 

Misfit,

I saw a Y pipe that allow you to run your cat and at a specific RPM it would open the second exit, without a cat. Call it afterburner in the noise range.

Bomboasy

 

Where? BTW..."Misfit" belongs to another member of NAM...unless you were addressing him...

 

They are called cut-outs. They've been around for a long time; some work on RPM, other pressure, and some have manual switches.

 

I was addressing the misfit, not the toy. All the same person. I have to look for the link. I showed it to Peter once. It has been a while. Let me look.


Bomboasy

 

they have Clark Gables Duesenburg. It has an exhuast cut out that could be done with a manual lever on the floor of the car. You can't see it during normal tours, but if you go to special events there, you can get close enough to the car to see it, just hangin there, for all (that are close enough) to see!

Cut outs have been around for a long, long, time!

Matt