welcome to the forum: because you have a new si, make sure that if it is under warranty, anything you install will be ok by the dealer service department. such as intake, exhaust, etc. modding is good, but cars under warranty that go bad, dealer will not cover if anything installed or modded was not done correctly and they will find it in their favor. they may say ok to install but the dealer will install in case something goes wrong, they will still do the warranty.