Originally posted by JonnySVT:
Quote:
I always though a certain amount of back pressure was good for N/A low displacement engines?
Why would you want expelled gases trying to push their way back into the combustion chamber? Not my cup of tea, but it's your car.... 
Oh I don't have much back pressure. But I had it explained that some of those gases are unburnt, there for stay for another cycle to get burned again. That would be why people would loose milage, at least thats how I understand it.
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