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Exhaust size

Yep, there's definitely a lot of science at work, the bigger the 
exhaust, the higher the RPM where the flow smooths out and you get a 
nice scavenging effect.  If you make it too big it will be way past 
redline and you never get scavenging.  You can lose a lot of power with 
an exhaust that's too big.  To get a well flowing exhaust, it has to be 
the RIGHT size (what that is depends on engine/intake mods), along with 
nice round smooth mandrel bends and high flow cats and mufflers.  3" is 
something you'd use for a big block V8 with some serious work done to 
it.

John Gates
--
'97 Jetta GLX
'85 Scirocco

-----Original Message-----
From: GREG DUNN <greggearhead@adelphia.net>
To: Edward Effinger <Eeffinger@conestogac.on.ca>; 
scirocco-l@scirocco.org
Sent: Mon, 2 May 2005 17:47:56 -0600
Subject: Re: Re:Exhaust size


I understand that the performance exhausts are on the larger
side.  This should allow more air through the system and
usually gives a slightly louder sound as well.

I would go larger.
Ed 81S
____________________________________

So if 2" is good, 3" is better?  Doesn't work quite that way Ed.  There 
are
some really good books out there on design of intake and exhaust 
systems -
they are great to read before dishing out advice.

gd


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