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-   Porsche 924/944/968 Technical Forum (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/)
-   -   Replacing the CAT with a muffler? (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/995995-replacing-cat-muffler.html)

PeterCarrera84 05-08-2018 12:15 PM

Replacing the CAT with a muffler?
 
Has any one done this in a non car inspection State?

Some one wrote me , but cant remember which type of muffler it was. I would like it to sound more like a Fabspeed w/o the expense (: :D

The car in question is an 89 S2 stock. with 97k

Any ideas ?

I have Borla cat back on my now for sale 08 Jetta(GLI clone) it does sound

very KOOL !! :cool:

v2rocket_aka944 05-08-2018 02:39 PM

you could do it, but it'll STINK without a cat.

PeterCarrera84 05-08-2018 03:33 PM

OK why did it not STINK when I did it to my old 84 911?

PeterCarrera84 05-08-2018 03:35 PM

so what would you recommend ? what really works ? a cat back ? which one if so?

9FF 05-08-2018 03:42 PM

Most Euro spec 944’s weren’t fitted with a cat and had a small intermediate muffler in its place according to pet.

v2rocket_aka944 05-08-2018 03:58 PM

Quote:

Originally Posted by PeterCarrera84 (Post 10030183)
OK why did it not STINK when I did it to my old 84 911?

maybe your nose isn't as sensitive...
i had a dead cat for some time and it REEKED...smelled like it was running rich all the time, but slightly different smell...CO poisoning for days.

it was a happy day to put a fresh cat back on.

RedCarGuy 05-09-2018 07:24 AM

Quote:

Originally Posted by PeterCarrera84 (Post 10030183)
OK why did it not STINK when I did it to my old 84 911?

If you've done it on other cars why are you asking again? exhaust options for 944/T/S/S2 is something that has been discussed ad nauseam on this forum and others. Do a bit of research and you'll find an endless supply of opinions and feedback.

PeterCarrera84 05-09-2018 10:03 AM

Thanks , but each car is a little dif. 3.2 oil kooled and 3.0 H2o kooled thats why I was trying to educate my self. not to make a mistake. Will do further research
Just purchased the S2 2 months . Thanks

924 05-11-2018 09:56 AM

Installed this cat last year with a borla, works great. The cat is a 3" for higher flow, just need reducers to go up a size and then back down. Same one that lindsey racing sells for a fraction of the cost.

https://www.amazon.com/AP-Exhaust-602207-Catalytic-Converter/dp/B000EPZEJI

http://i34.photobucket.com/albums/d127/jayzzzz4/1_2.jpg


http://i34.photobucket.com/albums/d127/jayzzzz4/4_1.jpg

PeterCarrera84 05-16-2018 11:17 AM

Factory cat equipped (same as factory decat) - 196.5 BHP @ 6500rpm & 184.2 ft-lbs of torque
Cat delete bypass tube - 197.7 BHP @ 6500rpm & 180.1 ft-lbs of torque
Cat delete custom resonator - 199.9 BHP @ 5500rpm & 199.2 ft-lbs of torque

The interesting thing is the differences in performance.

Cat delete bypass tube - +1.7bhp -4 ft-lbs of torque (yes MINUS 4 ft-lbs of torque!)
Cat delete custom resonator - +3.9bhp +15ft-lbs of torque

I found this on a previous post on 944 site. which had an explanation why this occurs.

In synopsis look at the results, has any one made a hook up like this replaced the CAT with a resonator? Like to hear what to have to say ,
thanks again

mikepellegrini 05-16-2018 06:32 PM

I punched the cats in both my cars and it never affected passing emissions.

What it did do was make the sound deeper and throatier - which I like.

There is no effect to the smell.

v2rocket_aka944 05-16-2018 09:40 PM

Surprising, having a dead cat made my car undriveable for more than a few minutes at a time. Smell sticks to your clothes.

So much better with a brand new cat now.

As to those dyno numbers, guessing that's a 968 or 951 numbers?

PeterCarrera84 05-17-2018 12:39 PM

S2 as far as I know from the post which I took it from, They were discussing S2 motors.

blackburb 05-17-2018 05:47 PM

Quote:

Originally Posted by v2rocket_aka944 (Post 10040086)
Surprising, having a dead cat made my car undriveable for more than a few minutes at a time. Smell sticks to your clothes.

So much better with a brand new cat now.

As to those dyno numbers, guessing that's a 968 or 951 numbers?

Maybe it was literally a dead cat:D

J1NX3D 05-19-2018 08:02 PM

This is my stock front muffler. Ptno is 944 111 985 00 for an 8v like mine, 944 111 985 02 for the S2.

http://forums.pelicanparts.com/uploa...1526788937.jpg

http://forums.pelicanparts.com/uploa...1526788937.jpg

PeterCarrera84 05-20-2018 05:44 AM

Thanks all the way from New Zealand, so you replaced the CAT with that stock muffler? How does it sound ?

PeterCarrera84 05-20-2018 05:58 AM

So this front muffler fits in the same space that the CAT was in ? Looks like a perfect replacement. Wonder how it sounds??

9FF 05-20-2018 06:17 AM

Quote:

Originally Posted by 9FF (Post 10030191)
Most Euro spec 944ís werenít fitted with a cat and had a small intermediate muffler in its place according to pet.

Quote:

Originally Posted by PeterCarrera84 (Post 10043570)
So this front muffler fits in the same space that the CAT was in ? Looks like a perfect replacement. Wonder how it sounds??

Thatís the stock factory muffler fitted on some row cars that I mentioned a dozen posts ago. Yes it fits exactly in place of the cat but really doesnít change the sound to any extent.

drkshdw 05-20-2018 06:20 AM

Quote:

Originally Posted by PeterCarrera84 (Post 10043552)
...so you replaced the CAT with that stock muffler?

NZ would be a ROW car which did not have a catalytic converter from the factory. It has a pre muffler which is what he is showing you and giving you part numbers for.

PeterCarrera84 05-20-2018 06:49 AM

of course , thank you


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