The sound you hear is normal. Its that CAI sound that everyone gets. However, like I said above, the bend in piping before the MAF can cause bad readings. Id stay away from that. You might also want to get your car on the dyno and check a/f to see if it changed any. That $400 could of been spent on gears and you would of gotten a better increase. Not necessarily in HP, but lots of HP doesnt necessarily mean quick 1/4 times.
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