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just so you know. a 3" exhaust is not the best for a na ka. 2.5 is the largest you want to go. 3" actually creates more back pressure than 2.5 because it allows the gases to cool faster which makes them more dense and harder to push out the pipe.
my car= reman kade, injen short ram, stock cat, resonator, 2.5" resonator back=142whp, 151wtq
with the 3" the day before it made 137whp, 148wtq.
now if you go forced induction like everyone here wants you to, then my statement is null and void. good luck.
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