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Who told you that you can see straight through the S3 cat ?
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Me, for one...
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Rubbish.
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You need glasses.
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They are 400 cpsi. Chop the cats off the pipe ,so theres nothing to deflect the light, and at the right angle you will see daylight. But not clear daylight.
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So you can see through them then?
I think so...
They are not restrictive...end of chat.
You can see daylight through them...you can see people, cars, birds in the sky etc, if you happen to be looking in the right direction.
Being able to see things through them means to me there isn't too much of a restriction.
I agree that 100 cell cats are easier to see through...almost as if there is nothing in them!
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Having said that, the point you make about them not being restrictive is true. Put a single Rossi 100cell cat on mine. TBH didn't make much difference at all ,and you can read a car number plate through it ! Hopefully pay dividends when I swap the turbo.
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...and I had twin 100 cell cats...and gained precisely nothing...dyno proven before and after.
Some of the Japanese car cats are more restrictive...you cant see daylight through a UK spec Honda ITR cat...but you can the Jap spec version of the cat (which also happens to ba a larger bore)...
But on the S3, as with most VAG cats...there is nothing to be gained.
You can see through a Mk3 Golf GTI cat too...
Changed that to a 200 Cell single...which you can also see thtough (strangely enough!)...and gained ...nothing. Again dyno proven.
VAG cats are efficient...and legal.
...and you won't throw a check light.
Waste of money.