Hi folks

I am considering an Aussie pipe with cat to get my car through it's mot.

What's the consensus on these? Do they work? Do they last? Is the cat ceramic?

Cheers

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GT4DC Events Co-ordinator
1996 ST205 UK

Hi,

i use a aussie frontpipe with cat (400CPI), it works finde but, i would buy it without cat and weld a 100CPI or 200CPI cat in, and it should be also cheaper

greetz

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KEEP COOL UNDER PRESSURE

street legal?.....perhaps in tschibuti

Just to follow up on Sunny's suggestion I'd give Hayward & Scott a call and ask their advice on what cat CPI they would recommend to pass an MOT. Also, there are quite a few people advertising motorsport cats similar to WRC rear mounted units. The rear mount would have the advantage of minimising the effects of any backpressure due to the cat. I assume these have to be street legal? The latest MSA Blue Book stipulates that most race and rally cars have to have a cat fitted to compete.

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

H&S gets my vote too.

To give you some guide line on CPI.
the E46 M3 comes with 300 CPI as standard. Upgraded exhausts are available with 100CPI cats.

I wonder if teh EGTs woudl be cool enough to allow metal cats to live if it is loceted in place of the rear silencer?





As per this subaru rally car
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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Focus WRC;

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René - Carlos Sainz 2433•5000
Turbocelica.nl | ST185 CS restoration and full rebuild

If it ain't broken.. it soon will be

I very much doubt a rear mount would pass a mot!. By the time the exhaust gets there it's stone cold in relative terms. I seriously doubt the temp would be sufficient to light off the cat under mot test conditions. Sure, it would probably work flat out but there's no chance at idle or fast idle imo

I've posted a few times about my aussie. It does pass but it requires an understanding tester who's prepared to jump through some hoops

Overall the quality is aussie, the fit is excellent but she sleeve joint execution is not great. Try searching for DJ's cat thread. Sure I posted about the aussie on there

I got this setup and the "fitment" (it didn't) of the cat is diabolical.
The cat is an aftermarket catco one and the diameter is not even close - I wasn't very happy.
In the end I had a straight pipe made up which is flanged but still haven't got the cat sorted out yet.

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Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

Interesting link to the supplier of WRC CAT's http://www.hjs-motorsport.com/english/home.php Lots of references to FIA and TUV homologation but I'm not sure how this would translate to MOT regs

The info for 100cpi WRC cats, 2 litre turbo engines is here:
http://www.hjs-motorsport.de/download/h_90950055_57.pdf

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Hi,

HJS is pretty expensive
http://www.isa-racing.com/product_info. ... toren.html

greetz

_________________
KEEP COOL UNDER PRESSURE

street legal?.....perhaps in tschibuti

"I am considering an Aussie pipe with cat to get my car through it's mot"

You may have changed your mind now of course, but just to advise "Batmobiles" had an Aussi with flexi mid section and sports cat for
quite a few years now and never failed on that aspect.

Only minor prob is its a fairly close fit you need to fit and position it with precision otherwise will sometimes knock on bodywork

Cheers and hope your all enjoing the weather its what they were built for !!

Says he toasting with just a small port and brandy by the fire and the last mince pie........

love it..

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Le Latern Rouge...300ish bhp 13.8 1/4
more to come... gonna love track days.