It's time to mock up th exhaust etc on the tiger so i need to think about a CAT, what have people gone for?. I'm running 2.0 black top on TB's and emerald ecu, with a 4-1 stainless manifold to 2"pipe and R1 can.
I found several online but am unsure whether I need 200/400 cell etc etc. I will be running wide band Lambda as well if it makes a difference

Any help is greatly appreciated.

I would guess at 400 for the IVA as that is the standard Cat amount.

200 cell is classed as a sports cat,the one I've used previously on a tin top took a lot of warming up to get the car through the MOT.

I passed IVA with a 200 cell cat. MX5 engine with standard ECU

With an emerald don't you get switchable maps? Could one be an MOT/IVA map?

Don't need one on the Lotus but when making up ones for customers I use 200.

I buy stainless, not ceramic, as they can break up, and the coned bodies are usually
409 so must be welded with 309 filler.


HTH
Paul G

With the 400 being standard size is there going to be a noticeable BHP difference between the 2.

3 switchable maps on the emerald. 1, iva/mot 2, normal 3, burning backwards through a hedge

I have a 200cell in mine made by these guys, http://tubeengineers.co.uk/. They make exhausts for loads of kit makers and are the supplier for the Fury. Fantastic piece of work and great for a visit if you can get there. Used on a 2.0ltr zetec and believe 200 cell is what you need when I asked the same question, 400 is OTT

Pictures of mine are in my build blog here

I've just got a 200 cell one from here to hopefully pass the IVA- http://profusionexhausts.com/catalytic-converters/sport-catalytic-converter.html

I went with a 200 cel and passed my IVA no problem and I'm running a mx5 1.8 on standard ECU

Passed IVA on a 200 cell + IVA map.

Any good for you?

http://www.locostbuilders.co.uk/forum/34/viewthread.php?tid=206795&page=1?#pid1731597