decat 318 is opinions

[LeonNewton]

im toying with the idear or puting in a strate through pipe wher my cats are in my exaust. tad moor power and noise with a still standard look. any advice wher to get one from or eney other pitfalls? wot will it do to my mpg?

[asmith88]

hi leon, yea it would certainly give you a little extra but im not sure how that works on emmisions, im sure someone will clear this up,

and yea you will have to compensate with mpg, but its the same with any power mod, shudnt be too bad though.

[Felix79]

Any car before late 93 can be decatted so you should be alright. Not sure if it will give any massive advantage.

[magpie]

more noise is all you gain,
it will sound like your going faster but annoy your neighbors.

i tried to make an m40 1.8 faster once.

[Brianmoooore]

According to BMW's own figures, an iS without a cat is nearly 10% better on fuel consumption, than one with! (On the constant speed figures.)

[LeonNewton]

all sound good. word on the street is that peco is about to go under. ssshhhh though. canot confurm this. as thay are 10 min away might go chat with them. i hate my neighbors. if it wur up to me id turn over my moter and smash ther windows. hehehe

[E30Mark]

Cnance are your Is won't have a CAT fitted anyway. Look to see if you have lambda sensor fitted to the exhaust, check under the battery tray for a wiring connector, if there isn't a cable going down to the lambda then you don't have a CAT.

[snoops]

Any car before late 93 can be decatted so you should be alright. Not sure if it will give any massive advantage.

I'm sure its August 1992

[LeonNewton]

i will check for a lambda sensor in the morning. i have cat boxes under the car. may thay be emptey? wotever the date i am before it. im 91

[E30Mark]

The front box on the iS does look like a typical CAT, but I've never actually seen a cAT fitted to one. I've decatted my 318i which is a 92 build and have no problems getting it through a MOT.

[Dan320is]

I'm yet to see an IS with a CAT fitted, the front box does look like a CAT though.

If you remove the front silencer all you'll get is an increase in noise, no performance advantage.

[asmith88]

theres me told

[magpie]

if you have a cat,it must be shafted.my IS has no cat.
if i had one that was ok,i'd not think about it's removal.
i'd look at a back box and cut the old one off if noise is the name.
my car was built in march 91.

[LeonNewton]

gess ill fill the little hole with some weld and leave it as that. no point paying for a pipe that dus nothing. but... then ther is my neighbors.

[rix313]

I think mine has a bit of pipe welded inplace of the cat