[Mk2] [NA] Exhaust help needed ASAP - thanks in advance

[jit112]

Hey all

Well basically, my exhaust has become a lot louder, and apart from the fact that its blowing, i think my CAT and temp sensor are gone.

Am thinking this may be an opportunity to get it fixed and maybe get a CAT back exhaust for the car. So need your help for some of the decisions.

First of all: my car is a:- Kreg 1992 rev2 G limited IMPORT n/a.

- Which CAT do i need for this model? and do you have any good places to get them?
- The sensor in the CAT, is that a lambda OR temp sensor? Could you please confirm which one and also specify where i could get one?

- Also once these 2 are clarified and fixed, is it possible to get a straight pipe from the CAT to a back box e.g. japspeed, hks silent hi power etc. and then obviously tail pipe.

- Is it possible to fit a HKS silent hiPower (think its that one) that USED to be fitted to a turbo, to an N/A? (it would only be the backbox, so would run a pipe from the CAT to the hks backbox.
And how would i modify it to do that? if you could explain steps so i can get a rough idea on how much it will cost, and so can explain to a mechanic, if its possible.


If you could aid me on any of the queries above, I would much appreciate that.

Thanks in advance all.

Jit

[Si_Crewe]

A bit of searching on eBay for "MR2 exhaust" or "MR2 cat" and "MR2 decat" will give you a good idea of what's available.

About the only thing worth paying attention to, IMO, is to get yourself a cat-back exhaust, a cat AND a decat pipe then bolt it all together with stainless steel bolts and lots of coppaslip then, come MOT time, you can bung the cat in to ensure you pass the emissions test and then whip it out again afterwards.

There are some fancy systems that do away with the cat entirely but, of course, if you fit one of those and then your car struggles with emissions there's no way to fit a cat back in.

There are 2 sensors in the exhaust system.

There's the oxygen sensor, which lives in the flexi downpipe (or on the manifold in later cars) so a new exahust won't affect this.

The other sensor is a simple temperature sensor that will light up a warning light on the dash if your cat gets too hot.
The easiest way to deal with this is simply to unplug the wiring under the carpet in the boot, remove the sensor from the old cat, remove the sensor completely then wrap it in a bit of foam, reconnect the wiring and wedge it in a bit of dead space under the carpet in the cornet of the boot.

No decat pipe will have a connection for this sensor and about the only cat's that do are OEM ones from Toyota.
Assuming you're going to replace the cat with a decat pipe and then only fit the cat for the MOT you needn't worry about that sensor not doing it's job.

You DO need to leave that sensor wire connected though otherwise the warning light on the dash will come on.
That's why it's easiest just to leave the wiring connected and just bung the sensor under the carpet in the boot.

Also, FWIW, if you plan to just fit a cat for MOTs then it's really not worth spending a fortune on a cat cos it only has to work for a few minutes every year.

[foxy-stoat]

You dont need a cat for the mot. It only has to pass on emissions.