New Exhaust System Advice

[matthew-lists@lehrian.com (Matthew Lehrian)]

Many new cars sport variable intakes.  For instance, Audi's V6 (2.8L 
and new 3.0L) have a variable intake manifold.  You could buy the VSR 
manifold for the 12v VR6, which had dual runners that would switch over 
at about 3300 rpm IIRC.  I imagine many other high-performance cars use 
similar technology.

Basically, at higher rpm's you want longer runners to create more fuel 
mixture velocity.  Though I haven't driven a VSR-equipped VR6, it's 
supposed to be quite a dramatic modification.

Matthew

On Sunday, March 23, 2003, at 11:04 PM, Kervin wrote:

> There are variable intake runners in BMW's 745.  VW did kinda the same
> thing with their 16v engines.  US models had narrower runners to move
> the peak power down the rpm range.