de cat what you think

[tigg]

i have an mtm re map and a miltek from the cat back. was thinking of doing away with cat.would i gain a bit more power and is it a prob with mot and emishions. in short a good idear or not

[Rusty]

3B or ABY?

3B = goodbye to the cats.

ABY - better to get a sports cat, will mean that it'll fly through the MOT then.

I'd get the OE DP cut before the Y piece and a 3" link pipe put all the way to the centre silencer. You can then have a de-cat pipe made and either a 3B cat modded to fit in place or a sports cat fitted.

Decat will give a tad more power although I was ruinning 297bhp on a set of OE cats and OE DP, made a difference going 3" tho.

[CREASE]

Fairly sure I get slightly earlier spool-up since cats went! Seems a few people on here still pass mots without them unall

[tigg]

its an ABY so sounds like a sport cat then sounds like big buks will have to change the clutch as well its a stock one still. i dont no what power i got but slips iff i pull away with full beans.

[Rusty]

Clutch is the same as an RS2 so will take way over 300.

Sports cat and link pipe will cost about £300.

Get a homefries in there too, you'll love the difference.

[s2driveruk]

[QUOTE=Rusty;397847]3B or ABY?

3B = goodbye to the cats.

QUOTE]


Not for all of us....in theory i need to retain mine..sport cat or verified removal of them if it will definately pass the emissions check hopefully quite soon. Local garage has said they will happily measure with and without to see how cloe to passing it is without them.

Sport cats at 100 or 200 cells are pretty close to the same throughput as not having one on at all, so probably legally the best way to achieve a decent result.

[andyg plym]

my aby coupe is running a straight thru pipe from turbo to back box,,,,,its much better than stock and it pops and bangs loads with the occasional flame too.
Also running a homefry and race air box by bmc so im reckoning on about 300 bhp and it peaks at 1.5 bar

[Rusty]

Mine passed MOT with output of 0.73% CO and 191 HC, up from 0.089 and 38. Doesn't seem right...

[tigg]

thanks for that peeps.i had a new clutch bout 2 years ago after the chip and exhaust is very smooth if i pull away hard and then smells of clutch a few seconds later so its not biting hard enough so either rong one or i got big power.cheap and nasty clutch me thinks

[Rusty]

Crap clutch. An OE clutch will take all manner of abuse

[tigg]

another case of if you want the job done rite do it yourself.is it a doable job with no ramp? if so will soon be looking for help to fit one at home. will have to stock up with pie and bear and get me tools out

[Rusty]

It's a pig of a job. Watched an experienced mechanic do mine and it too a few hours. Need to be strong too, box weighs 100kg ish.