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i don't have any mufflers so if i get an offroad pipe am i gonna burn my valves if i run it with no mufflers for a few weeks untill i get a mac cat back or would it just be really loud and do no harm
 

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It will be really loud for sure but it will cause your ride no harm. You may loose a little low end torque due to the lack of back pressure but you will be OK...
 
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