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Jun 14th, 2026
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Joined: Nov 2007
Posts: 782
Talk Morgan Regular
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Talk Morgan Regular
Joined: Nov 2007
Posts: 782 |
We love you Mol. Mol for President!
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Joined: Feb 2011
Posts: 14,009
Member of the Inner Circle
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Member of the Inner Circle
Joined: Feb 2011
Posts: 14,009 |
We love you Mol. Mol for President! Yes! Move over here and be President of the Club!! Probably harder than the US position though  That not denigrating that position by the way....you need to experience the club over here at the moment!!
Jays
Former Morgan owner. Gone but hopefully not forgotten!
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Joined: Feb 2013
Posts: 52
Just Getting Started
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Just Getting Started
Joined: Feb 2013
Posts: 52 |
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Joined: Aug 2013
Posts: 1,562
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Aug 2013
Posts: 1,562 |
Mol - I did the same as you and noticed the same improvements as you too. I do believe that the tiny CATs in the headers are a restriction to flow and were what looks like an afterthought, despite always being a mandatory part of the design.
Caterham Se7ens have very good performance CATs on them - but just look at the size of the things! In fact any performance CAT is huge if it is going to work efficiently - which is exactly what the M3W CATs aren't. So top work and if you don't need them for annual technical inspections, then so much the better!
An M3W with high-flow CATs however would look very different, which is what drove the current design of course. What do you plan to do come MOT time Ringa?
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Joined: Mar 2013
Posts: 1,016 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: Mar 2013
Posts: 1,016 Likes: 2 |
I have a second set of headers, complete with original CATs.
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Joined: Oct 2012
Posts: 2,822 Likes: 155
Talk Morgan Expert
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Talk Morgan Expert
Joined: Oct 2012
Posts: 2,822 Likes: 155 |
I have a second set of headers, complete with original CATs. Did you have to buy a set of headers complete with cats then rip them out or can the bare headers be acquired?
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Joined: Mar 2013
Posts: 1,016 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: Mar 2013
Posts: 1,016 Likes: 2 |
I just bought a set of new headers, complete with CATs from MMC - much cheaper than I expected..... I will fit them to my stock exhausts again and bolt them up at MoT time next year....
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Joined: Oct 2012
Posts: 2,822 Likes: 155
Talk Morgan Expert
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Talk Morgan Expert
Joined: Oct 2012
Posts: 2,822 Likes: 155 |
Sounds entirely sensible. Thanks!
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Joined: Nov 2015
Posts: 133
L - Learner Plates On
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L - Learner Plates On
Joined: Nov 2015
Posts: 133 |
I'm about to remove my headers and wrap and remove the CATs. Is the positive thinking on this still the same? I don't have to worry about testing. I'm good friends with the tester.
Dolph
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Joined: Sep 2015
Posts: 286
Learner Plates Off!
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Learner Plates Off!
Joined: Sep 2015
Posts: 286 |
Dolph, my experience with cat removal is with a car, your mileage may vary, but all cats work the same, so there are parallels that might be worth considering before you get the screwdrivers out.
I found no appreciable change in any measure of performance...either instrumented or seat of the pants. What was noticeable...and really noticeable...was the amount of smoke and filth that came out of the pipes under acceleration..so much so that the smell was quite noticeable. Likewise, the stuff that the cat otherwise would have burned off stained the back of the car.
Would it happen in a M3W? Don't know, but again, the function of the cat remains the same regardless, so it's removal does lead to an increase in stuff coming out. What I discovered is that it's removal didn't add anything beneficial to performance or the driving experience, so I installed a low restriction/high flow cat...and left the cat on my M3W and wouldn't even consider it's removal.
Last edited by ItsJustMe; 13/08/16 05:54 PM.
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