"Tami, John E" wrote:

Actually these days on Performance Bikes and Car's the manufacturers are
doing very well, using a lot of SS these days and carefully tuned lengths.
In the bike arena most every Dyno run I seen the past few years have shown a
decrease in power (but more noise!) when an aftermarket system is installed
and the fuel system adjusted. The competition is just too strong these days,
and exhaust tuning is relatively cheap compared to variable lift valves and
such!.

JET

 
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