Fitting a Hi-Flow Cat

Re: Fitting a Hi-Flow Cat (purple5ive)

Thu, 23 May 2013 09:56:26 GMT

mines is a 100 cell mettalic racing cat. but most higflow cats are 200 cell nowdays
yes ceramic ones become brittle and break with time..

Re: Fitting a Hi-Flow Cat (MANDALAY)

Thu, 23 May 2013 09:00:42 GMT

Hi-Flow cat is pretty much a loose term.

How many cells does it have ? A true high flow is only 100 cell.

Also the material makes a difference, i have found and many before me that ceramic units dont last long at all.

Metallic are the best.

Re: Fitting a Hi-Flow Cat (purple5ive)

Wed, 15 May 2013 11:04:39 GMT

With the Fujitsubo exhaust you have the option of having the cat behind the muffler as the piping is similar to stock..
its the guys that run, berk, ebay, Greddy Pex, Phoenix Pwer etc are the ones that suffer and have to do a similar version to yours
heres mine..

although atm im runnign an ebay one that has a cat built into it. but its a ceramic cat and i have a very good reason to believe the honeycomb like material i keep finding in my driveway means the cat converter has seen better days or doesnt exist there anymore lol.
the ebay cat/dump combo has the cat converter is almost exact same position as the stock one, so it works more effeciently. ill be lookign into doing somethign similar maybe cutting the cat out from the ebay one and replacign with a good quality one. but the cat is quite small and i dont have a picture anywhere to show what it looks like.
perhaps soemone else has one lying around

Re: Fitting a Hi-Flow Cat (Knightrous)

Wed, 15 May 2013 08:28:09 GMT

Nice work! I think this should be a stickied post since a lot of you SW20 blokes have issues with dump pipes and cramming CATs into place with aftermarket exhausts

Re: Fitting a Hi-Flow Cat (blacky83)

Tue, 14 May 2013 22:46:49 GMT

I paid $130 from Summit Racing, plus postage. Can be a bit rough, but if you buy some other stuff overall it works out okay. The whole thing probably cost me around $300.

Re: Fitting a Hi-Flow Cat (Mrskylighter)

Tue, 14 May 2013 22:08:23 GMT

I agree. top work man!

What is the price on that cat?

Re: Fitting a Hi-Flow Cat (Senor_2)

Tue, 14 May 2013 21:16:45 GMT

Nice work, looks like a good solution

Fitting a Hi-Flow Cat (blacky83)

Tue, 14 May 2013 18:07:54 GMT

It's a situation I'm sure many of you might have been in before. Getting rid of the stock catalytic converter, but wanting to keep a high flow cat for legalities.
I've got a Berk 3" downpipe and a Fujitsubo Legalis R, which provides a pretty free flowing exhaust, but it doesn't give much opportunity to keep a cat without hacking up some reasonably exensive parts. After a bit of searching around, and messing under the car, I came up with a decent solution.

This is the B pipe that comes with the Legalis R. I decided I wanted something to completely replace this, so that the exhaust was unmodified if I wanted to sell it later, and so I could keep a 'test pipe' for track days if needed. Although the Berk downpipe also has a flex section, this is before the solid supporting bracket so its effectively rigidly mounted to the engine. Fitting in a cat and flex section looked to be tricky. Furthermore, the B pipe is currently the lowest section of the car, which is already lowered, so I couldn't have it any lower and still have 100mm clearance.

I built a jig out of some scrap angle iron and some wood. The cutout in the centre shows where the engine sump sits in relation, so I could mess around with positioning and be sure it would clear everything.
The key was finding a cat which was pretty much perfect:

MagnaFlow 59979, 3" outlets, only 8" in overall length and one of the outlets is already angled. Ordered this, the shortest flex section I could find, and some pipe and flanges (a 2 bolt and 3 bolt)
Didn't take any pictures while fabbing it up, but I traced the mandrel bends onto some cardboard to make trial fitting it easier.

Excuse the dodgy looking welds, but this is how everything fit together.

Add a bit of paint to tidy it up, and its finished. In the end I'm really happy with the result. It doesn't sit any lower than the original B-pipe, so I maintain at least 100mm clearance. And I didn't have to hack up any of my existing parts.