not sure of the gains but i got a MS intake from a buddy for free when i got my car and it is dead silent unless you GET ON IT. the piping seems a tad smaller than some other intakes so the gains likely wont be all that great.
I actually have the this setup it really added a nice amount of power I have an auto 04 hatch so every little bit helps. The only thing I feel I lost some low end torque under 3k rpms other then that just awsome.
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