Ok some info.
They sound great, but a nice way to get a defect notice.
The concept is now being used by some car manufactures but with a diffrent twist.
The units are fitted further down the exauhst system, at a point where they are between the first and last muffler to give less exauhst restriction at higher revs.
They are not remote operated, instead a vacuum sensor on the inlet manifold senses no vacuum at wide open throttle and electricly opens the valve.
They only then work when ya gun it automaticly.
They sound oh so great.
I can remember whos using them atm, Jensen i think but unsure.
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