Several car (Nissan) and
> motorcycle (Yamaha, Aprilla) manufacturers are using the high-tech
> version of the old exhaust cut-out. A butterfly valve system upstream in
> the exhaust is computer controlled to direct the flow through the main
> muffler system in normal cruising but when you stick your foot into the
> metal it allows the exhaust to flow through a less restrictive, and
> louder, pathway.
The electronic contorlled butterfly exhausts have been quite popular
on performance cars since about 2005.. the aston V8 vantage, Jag
XKR's, Vette's Holden Bi-modals, AMG mercs (especially the c63) all
use this system to good effect.. i looked at a VAREX system for my
tiger back in 2009.. but as it was by remote and i dont have
electornic engine management to hook it up to and make it throttle
controlled i decided against it.. though i have seen them linked to
the engine on several Jap cars as an aftermarket install.
--
Regards
Michael King
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