How much will a hole in the exhaust affect power and gas mileage? For the power, will i lose top or lowend or both? Thanx

 

I don't know how many holes you have in your muffler and if they are due to rust or if something punctured them, but I know that since my whole exhaust had rusted I had problems with back pressure. You might want to replace the whole system depending on how old it is but several other problems can occur to like rough idleing.


-Matt