I guess you guys didn't read that muffler flow comparison that Car Craft did a few years back. They tested all of the popular mufflers on a flow machine and completely debunked the glasspacks are restrictive theory.
They found that glasspacks flowed as well as pretty much any other muffler.
Anyone who really believes they will get a 15% horsepower gain through free flowing mufflers has bought into the hype surrounding them. Seriously, that would be anywhere from 35-75 horses on a street engine.
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