Glasspacks or flowmasters?

[Tx Firefighter]

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.