The DP I modified was an ATS GT28rs pipe that obviously replaced any stock cat. I didn't like the idea of a street driven car
running catless for a couple of reasons, hence the search to find a do-able cat conversion. My take on the subject is, I sourced a replacement cat from an Australian company, to fit an Australian driven car..with a 5 year replacement warranty. Not perfect logic, but still defendable when it comes to ADR's. Is it ADR compliant?..I have no idea, ask the supplier, the receipt is in the glove compartment.

probably...
Are your wheels ADR compliant..muffler..new short shifter?
Does anyone really care that much about a rash of new laws, bi-laws, regulations and requirements that serve no practical purpose other than to enforce penalities and impose fines on the public, when car manufacturers are selling new cars that don't comply?. What about the new chrome wheel trims on your neighbours hyundai..are they ADR approved, or plastic crap from SC that will fly off sometime soon and hit some kid in the head?
Irony of it is, you can 'pay' for a licence/permit/certificate to do pretty much anything.
Ok..over it. I'll take it all back -:)
So who's worrying about the dope heads pushing amphetamines on the school kids????

Back on topic..so all you guys have stock cats, in the stock location right?..yeah right!

quote:

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Originally posted by MuMan

Real thing to look out for is the flow rate of their cat. I don't think they give any specs on the cat..do they?
If it's a ceramic core it will flow ~40% less than a metal cat of the same core size & cell rating. Plus it's a considerable drop in cross-sectional area from the OEM cat..just a thought. The good ceramic ones that size are around 200 CFM.
So any noticeable drop in performance or spool might be worth looking at.

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The cat in the ebay dump is only about 5mm smaller in diameter than factory cat (gen3)

Cheers

Factory gen3 internal cat dia measures 118/119mm (has thick cast iron walls). the outside circumference of the cat in the ebay dump is 358mm = 114mm dia. The metal casing/piping on the dump is say half a mm, so 113mm internal approximately, so about 4% smaller in cross section area compared to factory.

The ebay dump/cat is also 8.8kg lighter compared to the gen3 factory item, including the 2 lower brackets.

Cheers

I think if you want to minimise the number of large angle bends and the length of the exhaust, it becomes tricky to achieve in the mr2.

Cheers

That is surprising, didn't know they were over 100mm, so provided they are actually 120 cell and reasonably decent quality, they should flow close to stock specs. trouble is your still looking at a DP & cat worth $100 which makes you wonder what quality they actually are.

In my case I had to modify the DP anyway, as the berk exhaust was sitting off the bottom of the pan by only 2mm, and ATS pipes are designed to raise the b-pipe..same as berk exhausts do. Berk + ATS don't mix. Installing a cat in the b-pipe means dropping the pipe to install it, which means (a) less ground clearance (b) 1300deg F under the oil pan (c) it's not the stock location, so it's not legal.

So by adding a 100mm, 100 cell metal cat to the DP, the modification only cost the price of the cat ($250). It's a decent quality cat & DP, it's in the stock location, as close to legal as your going to get, and will out flow pretty much anything else you could think of doing.
Certainly worked for me.

The weight saving doesn't come into it if your looking at replacing an existing ebay DP with one of those cat pipes, but if you only get a year out of them before they crack, that's a lot of replacements/repairs as opposed to a decent quality DP. Hope they work for you guys..time will tell.

How are these dumps going for the people that bought them?
 
The one on the car seems to be performing very well, only had it running for a few weeks, but all seems good.  I noticed the stainless has turned a little yellow/blue in parts due to the heat, cant really see it but it doesn't look pristine any more (not that it worries me).
 
I re-used the factory gasket at the turbo, as it looked much higher quality than the one that came with the pipe.
 
Cheers

The one on the car still going good. Car doesn't get a huge amount of use but also been on the track for a decent workout and no issues.

Cheers