well
from some personal experiences My friend took his stock 1j and put a nice 3" exhaust on it and he definitley saw hp gains and boosted from 12psi to 15psi hitting cut somewhere now and it sounds very nice and spool is very smooth and fast. I would recommend a 3" exhaust For any inline 6 as to be Perfect i think a 3.5 is to big.. but i have yet to drive with one to compare.. 2.5 seems a tiny bit to small for my needs and hp wants
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