Dr. Jekyll Mr. Hyde?
I guess you are looking for cut-outs?
Where you can run thru mufflers and flip a switch to activate open exhaust??
I hear summit has electric ones that are medium quality.
You will need a welder or an exhaust shop.
http://www.summitracing.com/search/...s/?keyword=exhaust+cut+out&kr=exhaust+cut+out
Check out the link to some cut outs and pipes you can manually open up by "un-capping" them...
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