There are tools located in the trunk that could knock.. I also think that your wheel could be scraping a little bit (if you're lowered).
What I would recommend, is finding a decent corner, taking everything out of the trunk and taking it around the corner again. That way you can eliminate the knock.
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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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