dual exhaust?

[auditude at get.net]

Huw Powell one at humanspeakers.com wrote:
>
> > Ok, cool.  So, the stock exhaust is 2.125" dia pipes (x2) right?
>
> no...
>
> >  The Stebro is
> > 2.5" dia (x2) pipes.  So total areas:
> >
> > Stock: (2.125/2)^2 x 3.14 = 3.55  error: x 2 = 7.1 sq.in.
> > Stebro: (2.5/2)^2 x 3.14 = 4.91   error: x 2  = 9.82 sq.in.
> > 3":     (3.0/2)^2 x 3.14 = 7.1 sq.in
> >
> > So the single 3" system is on par with the stock system, as far as
> > total area goes.  If I did my math right, and there is no guarantees
> > there.
>
> why did the 2.125 and 2.5" systems get doubled?? what 5 cyl Audi has
> dual exhausts?
>
> What you've shown, is that the 3" pipe is double the area of stock, if
> stock is 2.125".

I think that was referring to the dual pipes of the 200q20v.  Two cats, and everything else.

Ken