I guess ill take a stab at it first...
Yes it'll be worth it.
You don't NEED headers first. You don't NEED headers at all.
Will you see a higher number if you have headers + your parts + a tune.. yes.
09 nismo puts down baseline 285-295whp + mods w/o headers = guessing 308-315
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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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