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dont get a high flow cat ive heard they ruin low end torque....u need torque more than horsepower so u dont want to lose it....id say ignition should be your next step...a msd cap and external coil...9.3 mm plug wires and some nology spark plugs should do the trick....i run bosch platinum 4's, 9.3 mm apc wires and a moroso sport cap and it does wonders for my d15....after the ignition system upgrade id say do fuel filter and injectors....maybe o2 sensors to make sure all your mixtures are correct.....
p.s. adjust idle and always remember to reset your ecu after every mod
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