CHANGING EXHAUST

[PHAZERMTX08]

WILL CHANGING ORIGINAL EXHAUST TO A AFTERMARKET EXHAUST HURT THE ENGINE OF A FOUR STROKE,SOME GUYS SAY IT WILL DUE TO BACK PRESSURE,OTHERS SAY IT WONT,ANYONE KNOW WHAT THE RIGHT ANSWER IS,LESS RESTRICTION IN THE MUFFLER WILL NOT GIVE ALOT OF BACK PRESSURE THEREFORE NOT GOOD ON THE VALVES.

 

[yamahaman]

i put one on and got 1800 miles no motor problems its just like a car u put different exhaust on them and its doesnt hurt iam sure there is power gains and power lost to