johnski

How hard is it to get thru MOT with full decat?
Is it expensive to put cats back just to pass?
Is it worth full decat for the hassle?

Fonzey

iTrader: (5)

You'd need to find an MOT'er willing to bend the rules to pass.

Probably an hour's labor max to remove a decat downpipe, fit a cat then reverse.

johnski

Cheers fonzey, how much do u think they'd
Charge for that? Have u got full decat? Ever been pulled by police?
Worried if I full decat my bugeye that I will be stopped and
Fail emissions test and get fined . Iv already de catted up pipe
Centre section and afterburner silencer. So it would just be the
Down pipe and mid cat section pipe?

lofty35

£60 to take my cat off and put my decat pipe on, i know an mot friendly place they just put it through without emisions test, never been stopped by police,

johnski

Ok cheers mate!! I really wanna de cat the rest of my
Exhaust but just don't know if bits worth it?
If I did decat the down pipe would it give me anymore bhp?

lofty35

think it gives a little more bhp , not sure how much maybe 10 bhp, i took mine carnetix they said it helps the car breathe better, i could also here the turbo spool , sound loads better

johnski

Cheers lofty, so mate if iv got a de cat up pipe a decat down pipe decat centre and backbox
In honesty it wouldn't pass emissions would it? So I
Would need to find a friendly mot centre.

johnski

Would I need to get it remapped after that?
What sort of remap would I need? I wanna
Get more bhp

lofty35

no wont pass, try find mot friendly place sling him an extra £10 , to NOT put it through emissions test.

adz556

iTrader: (5)

You'll need a remap mate, ecutek or open source .....but definitely need a map!

lofty35

best to have a remap to be safe, after u have decatted.
ask the others on here about best map to have , JGM mapped my old classic

Fonzey

iTrader: (5)

I'm running decat up-pipe, decat centre but a prodrive sports cat in the downpipe. In theory, it should pass... but I've never MOT'd the car while I've owned it. Will find out in May!

johnski

So your mid cat section is still in exhaust system?
What scoob Hav u got? What bhp r u running? Just to
Give me an idea what I can achieve .

johnski

Wow I didn't realise how much a sports cat down pipe
Cost!! Woooo very expensive, some are over 2k on ebay lol

Fonzey

iTrader: (5)

The centre section is just a pipe, the only cat I've got is in the downpipe.

Sports cat's aren't £2k!

http://www.scoobyworld.co.uk/catalog...oducts_id=1111

I've got a 2005 STi @ 315bhp

johnski

Oh ok nice!!! Mines only a 2001 wrx bugeye, I want
At least 280bhp. I got my centre pipe and afterburner box from scoobyworld
Cheers for advice fonzey. So with a decat up pipe
Decat/or sports cat down pipe decat centre pipe and afterburner rear silencer
And a remap do u think I could get 280bhp?
I need a better fuel pump tho

Fonzey

iTrader: (5)

I can't comment on power gains, but you should pass your emissions tests at least!

johnski

So what is the difference between a sports cat down pipe, and the
Origional cat down pipe? Will the sports cat
Let me hear the turbo spool up? What benefit would I get
Swapping cat down pipe for a sports cat down pipe?
Just trying to workout if its worth just decating all or
Like u say getting sports cat down p

angryscooby

Hi Johnski,

If you want more power, in my opinion you should get: decat UP, Decat DP, and cat pipe maybe this item or something similiar http://www.scoobyworld.co.uk/catalog...roducts_id=179 with full decatted system you will need a remap + upgrated fuel pump. These mods will take you to 280-285 range. Obviously you will fail MOT. I have been running with these kind of systems for years and I allways keep the original cat and put it back on it's place before mot, very simple and easy job to do.

angryscooby

I have allways favored decat's because they are usually cheaper than sport catted version. And with decatted one you will hear the lovely spooling sound

Original vs sport cat is that sport cat will let exhaust gases flow better.

Friend of mine have sport cat dp and I ca't hear turbo spooling as much as I hear in decat ones

johnski

Cheers angryscoob, so lets say I went for the whole decat system, when it
Comes to mot time I would just put the old down pipe back on and that would pass yes? So I really do only need one cat to pass mot. I think I'm gonna
Go full decat u know. I'm almost full decat anyway, iv only gotta get the decat down pipe
Do I need to change the cat pipe too then? Would the cat pipe have to go back on for mot too? Cheers for help. Let me know what you think

carlstoke63

Take it off and find a friendly mot place I do pass everytime happy days

angryscooby

I ment the main cat ( the biggest one) that is located under the car between dp and center section. I have passed Mot's in Finland with only main cat but I think they use same tools to measure emissions in Uk

tubbytommy

iTrader: (20)

you are not nearly decat, you are the same cat system as standard uk sti's a full decat will require a remap to to avoid overboost and engine damage.

with respect mate, you havent got a clue what you are doing or much understanding of what people are telling you, take it to a garage and get them to point out the cats and what needs to be done.

angryscooby

Picture above shows you what I meant, I thinks my english might be abit confusing because I'm finnish

johnski

Oh man I'm so confused lol, so the main car is the
One between dp and centre pipe, cool didn't know that. Can I just ask then,
So there's a cat in the up pipe one in dp, then the main cat, then one in the centre section! So normally there are 4 cats in total to an un modified exhaust

tubbytommy

iTrader: (20)

ffs google a pictue of your exhaust system as you havent got a clue

johnski

Ok cheers tubbytommy ��

darrenb87

iTrader: (1)

There isn't 4 cats in the exhaust system

tubbytommy

iTrader: (20)

no there are 7, or at least i think there are after reading this thread.

the cat,the pre cat cat, the uppipe cat, the ginger cat, the secondary cat, the next door neighbours cat....................