Most liked posts in thread: RMW "Race" Header or “Shorty†Header

Hope you dont want the race header for a everyday driver.

 

The race header is no less appropriate for the street than the shorty header--both of which require some planning and parts for worry-free street driving. If you are going to use the race header, which has a very sexy collector and no doubt the best performance available for a MINI, you'll have to cut and weld your cat-back to make it fit. You can also buy the corresponding cat back from Mr. Nice Guy himself for what I think is the best performance combination that money can buy. The compromises are that there's no cat, so it ain't street legal, and the Ozone Karma will frown upon you. You'll have to make provisions for O2 sensor simulation. The street header is very well constructed and does have a cat, but one that struggles to perform effectively in the MINI's harsh exhaust gas environment. The cat does clean up your emissions, but on some cars you can throw catalyst inefficiency codes, so again, you might need some simulation for O2 sensors.

The best scenario would be if the community would lean on Jan to produce the street header, with the only performance cat that can handle such temps: the HJS manufactured in Germany. The problem is that it would increase his costs by more than $400, so there would have to be people willing to pay top dollar for the product.

 

Or you could go MYNES V2 paired up with fabricated stock cat, super performance and NO CEL's

 

The only issue I see with the stock CAT is that it is a smaller diameter than the header tubing which would cause a slight restriction.

It has been on our MINI for over two years and is driven almost everyday by my wife. No check engine lights either.

 

Not entirely true... the opening to the stock CAT is 2.5 inch, and it's the same diameter as the tube and the exhaust (well, at least this is the case with the Mynes V2 header).

 

And any welder

can put a stub of any diameter onto the stock cat. The can it's in has funnel shaped ends.

Matt

 

yep, very true. But you dont want to get weld too close to the core b/c that might screw up the core... but the way we have it set up, it's 2.5" all the way thru with no CEL's...

 

Ahh...discussion on the part the OP is desired, but is this really the place as it is a Want To Buy thread.

If we would like to continue might I suggest the 1st Gen Engine Mods area.

 

+1
Mynes just arrived yesterday! Only one left I hear

 

Sounds good to me, but you do want to get an O2 simulator with a no cat header.

 

Mr. JIM

 

I have the race header and Jans exhaust on my car and it came with a cat. No problems . Contact Jan.

 

Still looking for a short header?

 

Did you ever get this figured out? I called Jan--there are several options on how to make this system work for your application. Basically I'm putting on the same setup Jan has on his car.