Thread: Why do people recommend map 1 over 2 on a JB4
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      01-18-2013, 09:08 PM   #9
Lifted07Duramax
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Quote:
Originally Posted by rdeterman View Post
map 2 requires down pipes to stay safe
Ok, but why? Less back pressure? and why is less back pressure making map 2 stay safe?
I have no doubt about it but Im just trying to understand why
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