Welcome! Great color choice!
Your next mod should be exhaust! Definitely get rid of that stock sound & either beef it up or quiet it down--- either way gaining some hp with a full catback!
LOTS TO CHOOSE FROM.
About the power...
Unfortunately you are only putting down about 260-270whp..
So getting to 400hp will not be possible without going forced induction!
You can get about 330whp though. Maybe 360-400hp at the crank!?
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2009 Brilliant Silver BASE 7AT | TEIN S-Tech Springs | K&N Drop Ins & z1 Maf Tubes | AAM S-Line Short Tails | 5% Tint | 20MM Spacers | Sport Spoiler NickTurnon's 370z Build
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