Smaller 200 CPI Catalytic Converters??

[Andyh-R6S]

Question:

Is it possible to get 200 CPI catalytic converters in different diameters?

The pair I had fitted last year are way too low (Keep clipping sleeping police men!!) and I was wondering if there is an OEM pattern type available or something with a smaller diameter to get some ground clearance back! (Removing them totally is not an option)

My S6 Avant has an Auto box, so space around that area is at a premium and I would rather try to get smaller ones rather than have a whole new exhaust fitted!

[Greg_S]

If you manage to find some id be interested too, got similar issues with clearance

[Rusty]

The 100cpi cat on mine is tiny, not much larger than the 3" pipe bore. Check out my gallery pics for some of the exhaust.

[Smiley]

What clearance exactly? (Not been there..)
They are available somewhere in oval:

http://www.avid-speed.com/de/kat/kat-hp.htm

[Andyh-R6S]

After a good rake through the Internet, it looks like these could be good but almost certainly I will need a new down pipe and other work to get them to fit correctly.

http://www.airpowersystems.com/wrx/cat-995-010-200.htm

I will have to measure my cars 'standard sized' 200 CPI cats I had fitted last year when I get home but I am pretty certain they are somewhere between ‘100 to 125 mm’ in diameter. If these ‘76.2 mm’ (3”) cat’s fit (I will need two) I will get it done. I suppose as well as benefiting from the smaller diameter, I will be able to have them fitted closer to the under body to, thus giving more ground clearance as well, which could be at least an extra ’25 to 30 mm’ minimum, etc.

However, is it prudent to fit an expandable/flexible joint before each cat to give a bit of flexibility? Or will good fitting do away with this issue?
(I occasionally get a knock when the auto box kicks down, where the existing (Too big) cats touch the underframe, etc)

Regards,

Andy H.

[Smiley]

Perfect find!

[Andyh-R6S]

Cat sizes to bhp !!

I found a web site yesterday that gives a table of cat size to bhp rating.

1. Can I assume that, (Working on the safe side.) since my S6 has two cats after the down pipe ‘Y’ splitter, if I use two 3” cats the flow across a pair (i.e. Cat 1 + Cat 2) the bhp split will roughly be 50/50 (ish)? If so, I can get away with using smaller cats with a bit of headroom for future tuning plans.

2. Should I use an expansion joint before each of the cat's?


Regards,

Andy H.

[Andyh-R6S]

A slightly bigger table that can be read might be more useful!

Hopefully this is more readable?

[Andyh-R6S]

Magnaflow Free flow cats in the UK

I found on ebay, a site that sells 'Magnaflow High Flow 200 CPI cats' in differing sizes from “£80” plus '£10' postage! Any body used Magnaflow kit before? Any good?

ebay site:

http://cgi.ebay.co.uk/ws/eBayISAPI.d...%3DI%26otn%3D2


Magnaflow site:

http://www.nemesisuk.com/magnaflow_website/performancecats.html

[maRS2]

http://cgi.ebay.com/ebaymotors/High-...446#ht_673wt_0

[M_GORDON]

I have a DP from Supersprint in 70mm (2,75") and I need too the Cata. But in my zone nobody have anything to 70mm