Cats - new reply to old thread re: How much restriction can a Cat be?

[Rabbit16v@attbi.com (Rabbit16v)]

Sorry man, couldn't resist!!  I think cats are probably the most restrictive
part of the exhaust since the exhaust has to go through the honeycomb type
piece where in mufflers or resonators they are straight through (for the
most part--I know mufflers sometimes wind around and sometimes have
fiberglass in them).  I know if you take the muffler/resonator off of a car
that has a cat it's not NEAR as loud as one without a cat.  HTH!!

Dave
----- Original Message -----
From: "T Berk" <tberk@mindspring.com>
To: "Rick Kellner" <rfkellner@snet.net>
Cc: <scirocco-l@scirocco.org>
Sent: Tuesday, November 19, 2002 11:54 PM
Subject: Cats - new reply to old thread re: How much restriction can a Cat
be?


> Rick Kellner wrote:
> >
> >     I am in the process of replacing my entire exhaust with a TT system
and
> > a TT down pipe so everything is off including the catalytic converter.
I
> > have never take this one off and was surprised to see how it was put
> > together.  It is just a can filled with screens!  I know people replace
> > these with high flow cats but how much restriction can these be?  Anyone
> > really notice a difference between the stock and an upgrade or even a
> > straight pipe?
> > Rick Kellner.
> > 84 8v
> >
>
> Rick,
>
> Sorry for the delay, I am just now going back over some unread list mail
> from October.
>
> Your look down the cat looks like it's screens but what you are seeing
> is a matrix or a ceramic type substance. Note how the holes are
> parallel, they are like long thin tunnels packed close together, side by
> side.
>
> A good cat doesn't restrict too much, and only really aids HP gains when
> in the near redline area.
>
> 'Upgrading' to straight pipe should only be done if it comes without
> introducing restrictions or changes in diameter. Hollowed out cats are
> worse than good cats because of this reason.
>
> If you are in California or some other state/area that cares you won't
> want to get caught without a cat in a car that came with one.
>
>
> hth,
> TBerk
>
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