it gives u a little more power up top. it killed the sound of my car though, made it really raspy and just bad in general. i just wana say that while alot of backpressure is not good for power absolutley no backpressure no only sounds like crap its also not good for torque. i had to put an extra resonator to get some backpressure plus it made it sound about 10 times better. so beware of that when u put ur header in.
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