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Discussion Starter · #1 ·
In May 09, I fitted an MP Performance 3" downpipe which very soon after, split in to two pieces. MP Performance kindly replaced it a month later.

Less than a year and 10,000 miles later, the CAT has given up. I noticed a faint rattle a few weeks ago and just haven't had time to look in to it. Last week, it sounded like I'd a piston eating the engine.

I took the car back to Powerflow in Stafford today and to my amazement, the CAT is rotten. It's all broken down inside and needs replacing. The car has been CEL'ing a lot recently with an 0420 (cat failure) but I put that down to a sensor failure rather than the CAT itself. Turns out it's true :(

MP Performance's service has been great, I can't fault it... but the DP quality is questionable to say the least. As the law has now changed with regards to CAT's, you need a BS stamped CAT in order to pass the MOT. ANY sport cat without that mark could fail, even if the emissions are OK; so I may have ended up replacing it anyway.

It's advertised as a "top of the line sport cat". In truth, it's a bog standard 400 CEL which clearly isn't up to scratch. The standard CAT is also a 400 CEL.

Anyway, just a word of warning. What looked like a bargain has turned in to a major headache. I'm not going to bother contacting MP again, I'll just put it down to experience. If you are looking to buy one, just be mindful of the fact it isn't great quality and if anything like mine, will let you down twice in one year; this time it's terminal.

:roll:
 

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Discussion Starter · #4 ·
Anyone have any knowledge or experience of using a 100 or 200 CELL CAT with a BSR remap?

BSR state they don't support them, but I'm not sure if that means it won't work (it will CEL) or if it goes wrong, they don't support it.
 

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Oh wow that really sucks, sorry to hear this. I bought mine late last summer and it's been on the car since problem free. I sure hope I don't run into these issues. This car has been a pain my **** already, yet I still love it..
 

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yeah I have a small leak forming on mine =(
right at the weld
 

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Discussion Starter · #7 ·
Quick update...

I'm going to a place called MIJ Performance in Walsall this afternoon to pick up a custom-made, 180 CPSI metal substrate CAT £130 + fitting (£40)

I've since learned that ceramic substrate CAT's (bog standard ones) all rattle when they let go. When I told the guy it rattled, he immediately said "it isn't a sport cat, that's ceramic". Apparently (and I'll take your advice on this) they don't make sport CAT's in ceramic, only metal. The one I'm collecting is a free-flowing version, which should reduce lag and increase power, if only by 5%.

From what I've been told, fitting a standard CAT on a tuned car would be like sealing up your exhaust; the gases can't leave quick enough (greater backpressure) so the turbo takes longer to spool and reach full boost.

If he's right, everyone who bought a stage 3 and an MP 3" DP could be stripped of some of the available power; all for the sake of £130 ish :roll: I wish I had bought a BSR version instead and saved myself the hassle.
 

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sucks to hear that man my jt is running strong but i also vbanded my cat onto the end so that way i can replace it when needed. magnaflow sport cat is a great investment
 

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so if someone were to buy one, they should get the catless JT and have thier own cat put on.
 

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If you have one of the downpipes that does not have a bracket from the pipe to the factory brace on the back of the engine like the factory you must add one to make the downpipe last.

This is what we do for the cars that don't come with a bracket. Simple additon.


BSR, Taliaferro downpipes have this. After speaking to JT they are adding one now.
 

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have one since last year and more then 20000km on it and font have any problem yet... next time ill lift the car i will take a look at it..
 

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If you have one of the downpipes that does not have a bracket from the pipe to the factory brace on the back of the engine like the factory you must add one to make the downpipe last.

This is what we do for the cars that don't come with a bracket. Simple additon.


BSR, Taliaferro downpipes have this. After speaking to JT they are adding one now.
thanks to let us know! i just install the mp downpipe a few week ago. i hope it will last with that trick!
 

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I used a 200 Cell Ceramic Cat and was told it might crack if it was under extreme heat and had lotsa bumps, but after 2 years, no issue. The flow rate was good and exhaust temps were fine.

I also had one of the those brackets Nick uses and I suppose that saved the DP.
 

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Discussion Starter · #15 ·
OK... 200 CELL metal substrate CAT is now fitted and OMFG! Without sounding too much like Jeremy Clarkson... POWER! :D

It's so bleedin' quick! It pops/bangs quite a bit though and I'm told it spits flames on the overrun but god, what a difference.

To be honest, I feel ripped off. I've run what I thought to be stage 3 for nearly 12 months and actually it was nothing like it. Replacing the hopeless MP CAT has really transformed the car; the difference is as big as from stock to BSR stg 1.

I'm hugely impressed and I'd strongly recommend everyone to upgrade as soon as possible; remembering to disconnect the battery to reset the ECU.

The guy that fitted it (and the entire exhaust, Phil @ Powerflow in Stafford) said the MP CAT looked very similar (if not identical) to a saxo 1.4 CAT.

I paid £130 for the CAT and £15 to fit it. Well worth every penny. I'm off for another blast; and I've not done that for a long time. :cool:
 

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so I dhould replace the MP cat that i have to an other one..

You really saw a big diff just by changing de MP cat for an other??

does you cat was all messed up or its just a restrictive cat that MP sell??
 

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Discussion Starter · #17 ·
@glowing626

The difference is like night and day, it really is. If you look inside the MP CAT, you will see exactly why it's so restrictive; even the stock CAT is better suited to a higher performance remap.

If I can get some good photo's (it's dark in there), I'll show you exactly why it's just not suitable.

does you cat was all messed up or its just a restrictive cat that MP sell??
Both.

The MP CAT was certainly knackered; the ceramic is rattling. True sports CATs are 200 cell or less and NEVER ceramic; they are always metal substrate. Even when brand new, it's not a "top of the line sports CAT" and two exhaust specialists have confirmed it; the first within seconds of looking at it. I'm not a mechanic, so I can only pass on the mechanics comments and comment on my own experience.

Knowing what I know now, I would have replaced the CAT before I fitted it. Actually I lie... I would have bought a BSR and be done with it.

I'll throw a couple of batteries in the camera tomorrow and film the sound difference with just replacing the CAT. There's so much more flow (more flow, less back pressure, quicker boost = more power) and sound is deeper and more sonorous.

As I said earlier, if you remember the feeling of going from stock to stg1, it's comparable to that... and less costly. I can't use enough smiley's to express it ;)
 

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Discussion Starter · #19 ·
Oops, meant to add...

For those in the UK, all CAT's must be type-approved as of the 13th August 2009 for vehicles registered from 1st March 2001.

Metal substrate (IE performance CAT's) are never going to be type-approved and are illegal to fit. If you go for an MOT, the garage can legally fail your car even if the emissions are within acceptable limits; just because you don't have a serial number engraved in the CAT.

Stupid I know, but hey... that's Labour for you. Even more stupid is the belief that anyone will take notice of it. Sign to say the CAT is going to be used for "off road use only" and neither the garage nor you can be held accountable. You just need to find an MOT place willing to break the odd idiotic rule. Also, my CAT is classed as "universal" and exempt from the rules. ;)

If the emissions are too high, fair enough... but failing it for a lack of a number is bonkers.
 
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