This page is under continuous development
The purpose of a
performance exhaust (sometimes called "sports exhaust", "higher-flowing
exhaust", "cat-back exhaust", etc.) is to make the engine run better.
to look for in a performance exhaust
As with most of my
other advice, I cannot quote actual laws of physics or gasoline engine
properties, but I can tell you the ideas behind it.
When you buy a new
car, the whole car is tuned to give you the best balance between comfort,
fuel economy, performance, longevity, reliability, etc.. While this
is a good idea, because the car will last a long time, will be good on
fuel, will be relatively quick, comfortable, and have a good audio system,
most cars are not tuned for performance when you buy them from the factory.
Some may argue that true sports cars like Ferraris and others are, but
you only need look at people who own them and modify them. While
they are insanely quick (especially for our speed-limited roads in North
America), there are those with big budgets who tune them up to 1000 HP
Let me get back on
the VW Fox topic. VW of America, when importing the Fox from Brazil,
decided for all of us that we would get an inexpensive car that was tuned
in the performance department. (Not to mention lacking power mirrors,
engine options, sports seats and many other options available in Brazil.
The exhaust system that came on the Fox was really badly designed as far
as performance goes. The diameter was about 1.0" - 1.25" and that
was very reduced at each bend and especially around the rear "axle" where
it got flattened. Furthermore, a restriction ring was inserted into
the exhaust system just ahead of the catalytic converter (or resonator
on earlier Foxes). This "donut" restricted to about 1.0" or less!!
Definitely not what you want for performance. If you simply remove
this "donut" your Fox will have engine output much closer to a Golf or
Jetta of the same year. (Click here
for info on how to remove it.)
There are only a
handful of companies who actually made aftermarket performance exhaust
systems for the Fox, and only a few of those still do. Here are the
ones that I am aware of (please let me know if you know of any more):
with any and all comments, and especially if you can add to this page!
Techtonics tuning -
and it includes everything you need to hook it up (gaskets, bolts, hangers,
I have one of these
on my car and have absolutely no complaints. The quality is superb,
it fit without any problems, and included everything I needed.
Eurosport - http://www.eurosportacc.com/
From their web site:
"We use an increased diameter of mandrel bent aluminized steel tubing in
our designs to ensure maximum flow and horsepower. Our systems will
give you a 7-12% horsepower gain along with a sporty, track tone."
to Fox exhaust page.)
No mention of exact
diameter. Clamps, hangers, instructions and 2 year limited warranty
Thanks to Chris Chan
for info on Eurosport's exhausts.
Leistritz - http://www.leistritz.com/sportsound/index.html
Now discontinued, but
they still have some stock left (January 2000).
A fellow Fox owner tells
me it fits all Foxes (not only 1987-1990 like their web site says).
He also says that the bends weren't perfect and required some tweaks to
make it fit; the work required was minimal and only around the heat shields
to prevent minor rattling.
Their web site claims
that both torque and horsepower and significantly improved in the 2500-5000
RPM range, peaking precisely at 4057 RPM). There is no mention of
Autotech - http://www.autotech.com/
They used to make them,
but their web site no longer lists them. You may be able to find
some old stock in a local shop.
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