to you bud!!
Yea, it does take about 7 to 10 days to have the ECU adjust to the new intake, and the power gain from 3k rpm and up is quite obvious.
I installed the ARK Grip last month, sounds awesome!! Deep but not loud, burnt tip does look very very nice.
Other stuffs are more exterior, spoiler, wheels (having a new set on its way tho), white LED plate and doom light, shift knobs, kenwood HU..
I will suggest exhaust worth it's money very good.