Engine Drivetrain 1st Gen Cooper S Most liked posts in thread: De-cat or Megan header?

I would, personally, go with a muffler bearing upgrade, instead. OEM muffler bearings are a huge drag on horsepower.

CD

 

Well, not eeeeevery bolt on. You need a header remember :wink: :devil:

 

If'n you have a much modified engine doesn't it stand to reason you would want to free up the exhaust with a less restrictive header ??

 

Okay, so this is a race car. I wasn't sure. Laws are different for street cars. So, get you a coat hanger and a drill and gut those pre-cats.

CD

 

If I'm not mistaken if you gut the cat the cpu will not be happy because it is expecting to see different readings between the pre-cat sensor and the post-cat sensor. You would definitely need a tune that compensates for that. I've done gutted cats or cat by-pass in the past but they were on older cars that only had 1 sensor pre-cat.

 

Since you are into making poor decisions buy the Megan header. opcorn::lol:

 

Troll :lol::lol::lol:

It's not a pre cat it's called a collector for the four exhaust pipes before the connect to the flex section. It's also known as a sh!tty MINI design. Save your pennies and buy an RMW street header. While you are saving for a quality header try reading more and posting less. :ihih:

You would learn a lot.

 

Really that's the best comeback you have. :lol::lol::lol::lol:


Not to mention I was right about your OEM exhaust manifold.

 

Chill....I think Dave-o has some VERY valid points...
Let's face it...your mini experience has been...er...uneven, with a steep learning curve. Folks are just trying to help guide you...
If you don't want to learn from our experiences, don't ask, and certainly don't ridicule us please.....
Cheap headers work...for a bit..the OBX units are famous for cracking...the lack of a flex joint...
IMO since you have " every bolton possible " the stock header is holding you back...get the best, the RMW, weld on a high flow cat, and be done....if you want to go pennywise and pound foolish....well...we will keep reading your threads.... Maybe even reply. Honestly, they are somewhat entertaining....everybody knows somebody who seems to have terrible luck...the equivalent of a slow motion train wreck...and here we get to read what goes into it...
My take...
Buy your parts, have a good car....
Buy junk parts cheap...have a junk car.
Nuff said. You have spent so much to this point, on a STOCK HEADER....wow...if you want too keep the car, get a good one...
If you expect the dump it in a few months, toss an OBX or eBay special on it...either way, it's not gonna pass inspection, so it better be an off road race car only.
If you want a street legal car...the RMW header, with a cat is a good choice.

 

Being it's Earth Day and all....

Use a catalytic converter dang it, your grandchildren will thank you.

As to header choices.

OBX or Ebay - JUNK

Megan - Slightly better Junk

Manzo - Even worse than OBX level in junkiness, a waste of metal.

Milltek - Nice stuff

RMW - Really nice stuff, come in short or race.

There may be others out there. I have seen and / or used all of the above.

We've had this discussion, it's fine that you bring it back, always nice to cover old material to see if anything has changed. http://www.motoringalliance.com/forums/cooper-s-engine-and-drivetrain/13975-r53-headers.html