Donut begone!

Removing the restriction "donut" from the exhaust

If you bought your Fox used and it doesn't seem to be as slow as other sub-compact economy cars (i.e. Hyundai Ponys, Ladas, etc.), chances are this has already been done by the previous owner. [Please don't take my comment as an "insult" to Hyundais and Ladas; I'm merely using them as examples of cars in the same class.) Another "easy" way to tell is how much fuel your Fox uses: with the restrictor in place you can get about 650-700 km per tankful (or more, depending on your driving style); with it removed you'll get 500-550 km per tankful.

Once you remove the restrictor, you'll have almost the same power as a Golf/Jetta of the same year (using the same injection system, be it CIS/CIS-E or Digifant I/II). About the only differences in the engines then is the orientation (the Fox's longitudinal vs. transverse) and the 180^o turn from the air cleaner assembly to the throttle body.

The exhaust restrictor is a donut-shaped piece of metal found in the exhaust system directly ahead of the catalytic converter (or resonator if you own a 1987 or early 1988 Canadian Fox). If your exhaust is in good shape, you can just remove the donut, and put the exhaust back together. If it's rusty, however, you would be better off to get a similar donut (be it with a larger diameter opening) from an Audi.

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