It's a "scam" because it takes money from the customer for something that's unecessary or bogus. It's just that simple.
Sound is NOT the issue. One can make their vehicle sound ANY way they wish.
Headers separate the exhaust flow, so it can move out faster and that's why people buy/install them.
These bogus pipes combine it again, slowing it back down, defeating the basic purpose and that's stupid. Plus; a waste of time, money and effort.
It started in the 50s because, it was a quick fix for "noise" tickets. :rolleyes:
One attractive "dyno result" changes nothing.
You must build your system (proper mufflers) to comply with noise regulations & 'common sense' operations with each side separate. To do it otherwise is simply misguided. Plan your system and just have the Muffler Shop bend the pipes to fit your vehicle.
Happy trails to all.
