The "X"
System
The exhaust gases from left and right extractor mix
in the x section,this evens out the exhaust gas back
pressure ,giving the engine a much smoother note.
A slight reduction in overall diameter in the x area,
the exhaust gas speed increases through the x which
helps [slightly] by creating a scavenging effect.
On a similar
engine, our 3" x system ran same 1/4 mile time
with the system on or
off ,on a 500hp engine this exhaust system gained
5rw hp from running open pipes
