madmarx

iTrader: (1)

Which cats can i de-cat without it affecting the MOT ? 2002 bugeye turbo.

petethemeat

iTrader: (6)

Mine has had the uppipe cat and mid pipe cat removed. Down pipe cat still in situ and it passed the mot

GC8

It depends how familiar the MOT tester is with the cars original spec. If they know nowt then you can remove all apart from a sports cat downpipe, but if theyre on the ball then removing any of the (potentially) three cats will be a fail, even if it passes the emmissions test.

scooby red

iTrader: (2)

Remove all and find the right tester

madmarx

iTrader: (1)

Well he cant see the up pipe cat because of the undertray so that one should be ok i hope.

madmarx

iTrader: (1)

I will get a de cat up pipe and second de-cat for now then. MOT isnt till end of October anyway. I wouldnt mind having to refit the 2nd cat for the MOT to be honest, just didnt want to have to change the whole lot. Cheers.

chopperman

I would say all except the down pipe. The advantage of keeping the down pipe cat is it will get hot quickly so start working sooner for the emissions test. I have only a 100 cell sport cat in the down pipe and have never had MOT issues.

madmarx

iTrader: (1)

Found 2 up pipes. 2inch and 2.5. Do i need the 2.5 inch de-cat up pipe ?

AN07 PTN

y dont u just get a full decat system then put ur old system back on for mot ... cost around £20 for a local garage to swap ehausts over ... job done

petethemeat

iTrader: (6)

Going from threads about removing / getting access to the uppipe on here, I don't think you would want to remove it on an annual basis . That approach would be easier with a cat back (mid pipe cat) exhaust but to be honest not many people could be bothered with the hassle of having to change it every year - I know I couldn't

ozzreid1964

iTrader: (32)

i got a decat up pipe prodrive sports cat down pipe decat 2nd de resonated pipe and cobra back box and it flew through the m o t no problems

AN07 PTN

Obv I would change the up pipe at the start but at mot time just change from turbo back for mot....

Midlife......

iTrader: (2)

De-cat the up-pipe and you will need to work around having a missing EGT sensor.........(presuming it's a WRX bug).

Shaun

AN07 PTN

Surely it will need a map after removing cats anyway so will a map not solve EGT problem????

Midlife......

iTrader: (2)

You can de-cat the Bug WRX without a re-map as the ECU sorts out fuelling etc and the TD04 doesn't overboost as it is too small.

Makes a bit more noise and spools a little earlier though LOL


Shaun

daz1968

iTrader: (13)

Regards up pipe dia, I would go with a standard sti one not aftermarket.

madmarx

iTrader: (1)

What diameter is the de cat up pipe on a Sti ?

madmarx

iTrader: (1)

The up pipes i have seen have two threaded tappings. Is that where the EGT goes ? Is it because it is a straight through pipe the EGT wont work ? Can you buy or make device that goes in the multi plug to trick it ? Eg, resistor etc ?

petethemeat

iTrader: (6)

I have the STi item in mine. In order to cancel out the EML light (because the EGT is removed) you need a 2.2kw resistor that bridges the gap in the EGT connector (in front of the drivers side suspension turret) - this does the trick

madmarx

iTrader: (1)

Thanks mate. Theres always a way. What diameter is your up pipe ? 2 or 2.5 inch ? I have seen both sizes for sale.

madmarx

iTrader: (1)

Good news. I looked under the car today and the 2nd cat has the de cat pipe already fitted. So all i need is the de cat up pipe. Looks a fiddly job with limited space.

madmarx

iTrader: (1)

Think im going to get this one. It has a port for the EGT.

http://www.ebay.co.uk/itm/SUBARU-IMP...item35ac9ed039

petethemeat

iTrader: (6)

I don't know for sure as it came with the car , I would assume 2.5 though as its an sti item.

The one on your link looks a decent price however I wonder what the fit etc is like ? I have read that people remove the up pipe cat due to potential disintegration and knackering the turbo but I have also heard this about the egt probe so if you are keeping it then I would check this out, however if could just be people scaremongering.

Pete

madmarx

iTrader: (1)

Thanks for that Pete. Basically anything before the turbo is a damage threat so i understand the fragmentation damage issue. So the safest way is de cat and no EGT sensor meaning no breakaway parts between engine and turbo. Simplzzz.

SinghSuperStud

iTrader: (2)

Sorry to wade in with something random but I remember seeing a post on here suggesting that decatting the up pipe (I think it was this one) could lead to the build up of noxious gases within the cockpit?

Bit worried about doing mine now due to having a 15month old daughter who sometimes gets ferried about in my Bugeye.

Is there anything behind this logic?

cheers

Jai

madmarx

iTrader: (1)

Only way to have gases in the cockpit is to have a leaking exhaust. The exhaust should be sealed till the backbox exit.

Send me a link to them gauges.

SinghSuperStud

iTrader: (2)

The ones I'm selling?

madmarx

iTrader: (1)

Yeah.

SinghSuperStud

iTrader: (2)

PM sent bud

daz1968

iTrader: (13)

I wouldn't touch one of those flexi joint ones. Either get a newage sti or any classic up pipe and fit that and use a resistor to fool the ecu regards egt sensor. If you want to splash out then get a Harvey up pipe. A lot of the cheap ones are far to big on the bore and actually decrease exhaust gas speed and increase spool time.