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The ones I have seen just open up the open pipe and leave the muffler pipe open also. I have heard the manual cable ones end up binding alot. I like the looks of Warlock's muffler that has a built in removable plate and also Jeg's exhaust cut out. However, both of these would require you to get under the vehicle to open the exhaust.
From what I have read, the 1/4 mile gains are nominal. Your mainly just getting the sound.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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