I have never heard if this. It is more on the part of tuning the motor. Most Harley owners remove the baffels but do not re tune the motor to deal with the lack of back pressure. This is also what Blues the exhaust on harleys. I have seen chrome pipes on a harley that are 10 years old that look new. And others less than 3 weeks that have 8 inches of blue. With fuel injection the computer can rectify the situation on a basicaly stock motor. So i beleave there is no fear in any trouble in the free flow mufflers.
A lot of "old" mechanics live and die by what they learned so long ago, and refuse to realize what technology can do today. I am not slaming mechanics, this hapens in every industry. But as far as mechanics I like to find the middle ground---Not the "old Boys" Nor the sparkeling new guys. But the guys that learned from the old guys but are young enough to learn the new stuff.
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