[addz]

morning all... i have recently purchased a mcs and i feel the need for a few "personal" touches.
saw a de-cat and manifold on ebay for about £200 but not really sure if it will make much difference, also what can be expected from a de-cat?
thanx adam

[1320autos]

Unfortunatley until someone buys one and has there car dyo'd before then after its hard to say how much horsepower / torque its going to make and at what part in the rev range.

Dont for get to take into account that if you bought that manifold you would either have to adapt your std cat to fit for the MOT which unless you are doing it yourself will cost you more money.

Also if the quality is sub standard it could cost you more in labour to fit the manifold.

A pulley and an exhaust manifold should be your first mods if you're looking for horsepower.

WELCOME TO 1320autos.com

[addz]

the one i have seen comes as a de-cat and manifold together, ill post a link after i have reached 5 posts lol..
just wondered if it would run alright as i know on my clio if you fitted a de-cat it wouldnt run very well as it messes with the air sensors and stuff

[philly c]

I purchsed that manifold and de cat and my mcs runs great and goes like a rocket made a HUGE differance!!!!!!!!

The only prob i have is that the engine managemnet light is on all the time as a result of the o2 sensor getting confus3ed but i have purchased a o2 simulator whihch should sort the problem out!

i want to get the probme sorted before o get my MTH re map.

[Jaw_F430]

Quote: Originally Posted by philly c (original)

I purchsed that manifold and de cat and my mcs runs great and goes like a rocket made a HUGE differance!!!!!!!!

The only prob i have is that the engine managemnet light is on all the time as a result of the o2 sensor getting confus3ed but i have purchased a o2 simulator whihch should sort the problem out!

i want to get the probme sorted before o get my MTH re map.

Does this fit straight on?(no make up pipes needed). And will this go straight on to a JCW cat back system?

Does it sound good as well?And what do you do when you take your car for an MOT?

Have you got your engine management light off now?

Regards

James

[philly c]

it fitted straight on to my standard exhaust then i shortely bought the milteck cat back system to complete the whole exhaust system.

The sounds that came from the manifold were amazing and there were no extra pipes required.I have to say its the best mod i have purchased to date for performace"


I fixed te engine management light and fault code through using an o2 simulator from o2 simulator.com or sumthing like that. The simulator send the correct fault code making the de cat no longer a problem to the ecu.


It was a bit of a chew fiting it but i got there in the end,i wouldnt say it was hard at all!"




phil
well worth it and it even sounded good with my standar exhaust"

[steve11]

Dont know what your laws are like over there but here in OZ if you are caught not running a cat converter you can be charged by the EPA (environment protection agency) which results in a massive fine.I am running a quality hi flow cat & getting very good results.Tread carefully.

[ongwc]

Hi,

How is the sound without the CAT? Very loud? Do you have sound file without a CAT? It will be greatly appreciate if you can attach the sound file or you can record the sound without a CAT... would like to hear the different

Thanks alot

Quote: Originally Posted by philly c (original)

I purchsed that manifold and de cat and my mcs runs great and goes like a rocket made a HUGE differance!!!!!!!!

The only prob i have is that the engine managemnet light is on all the time as a result of the o2 sensor getting confus3ed but i have purchased a o2 simulator whihch should sort the problem out!

i want to get the probme sorted before o get my MTH re map.

[Minipnut]

in aus your car will be defected + confiscated + massive fines if found using it on a public road

[philly c]

i think a de cat is only allowed for off road use and a sports cat is the ideal solution to the problem.

[Minipnut]

ow i thought i might add 2 weeks ago my mate from school was hooning around in his civic with a decat and running Av Gas (aviation fuel 150+ octane ??) He is now facing 250k+ in fines and 5 years in jail!

[philly c]

thats a big fine!over hear we are only allowed to use aviation fuel on track days as the de cat also.There is a track very close to my house and hense why i have the de cat.For road use a sport cat is required but these can be purchsed from the likes of lohan and roland. there are almost like a de cat but are fully legal and will probably pass the mot. I will soon find out as i have an mot due very soon.

[BigShow300]

Thank god someone else has bought this ebay manifold and given it good feedback as I'll be fitting mine shortly. Just to put peoples mind at rest re runnning a de-cat, yes it can get you in trouble if the police find out but more than likely you'll get asked to put it right and prove that you have done.

A fellow london tunnel runner drives a 355 with a de-cat capristo stage 3 and its monster loud. I was behind him when he got pulled over a few months back, the police made him aware that there was a 75db limit in Kensington at night and that he was easily breaking this. Then they admired his car and sent him on his way. I doubt any police carry emmision testing equipment with them anyway. Do you know of anyone who's been done in the UK?

I don't think our plod look at it the same way as they do in Oz. You're more likely to be pulled up here by the tree hugging police for slowly killing the planet one mile at a time ;-)

1320 - Can you PM me a price for fitting the manifold and putting it on the dyno and I'll pop over so we can establish before/after figures.

[Jaw_F430]

How much did you pay for your o2 simulator and is it a specific mini one or universal?

Regards

James

[MiniPetrolHead]

Hi all,

when i put my manifold on it made the emissions light appear even though i have a sports cat, how come this happend do you think?

Alex

[philly c]

its because the emmision flow is so high that the ecu thinks thats the cat is broken and hence the light comes on. The o2 simulator solves this problem compleately. It was a sooper peice of kit for about 25 pounds i think will post the site up:

O2 Simulator

try that
there is a specific mini one i think!

[Richard Crofts]

Best bet is a manifold with removable cat....like a GTT one or Janspeed etc etc etc. Then you can just jump underneath undo some bolts and throw the decat on for track days and drag strip

[BigShow300]

As my CAT is coming off I thought it a good idea to get it MOT'd before Monday so at least I've got a year before I have to worry about the fact I'm running a de-cat.

I found an interesting thread on another site about local council mot stations being cheaper than your average kwik-fit or local garage by about 20% (just booked mine in for ₤40). The main point though is that they don't repair vehicles for the public, only test them, so there's no financial incentive for them to fail the test unless it's genuinely warranted.

A list of council MOT stations can be found here:

MOT Cost Cutting: Slice the cost of repairs...,

[Cooooooperslad]

Anyone got any idea of the kind of power a de cat manifold adds?

[philly c]

not sure but i m sure its got to be a fair wack aropund the 20bjp with the manifold i would say.

The reason i make this estimate is that you no a mod has to be good when ya can feel the power increase straight away.