That is the TYGA suzuka style upper. $280 (aus) from tyga. As for ram air, correct me if im worng but is ALOT of work, not quite as simple as it sounds from reading one of matts posts a while back. . And as for the 21 verses 28 question, just get one of each Also if you search around the tuning section of this site and tyga-performance.com you will find answers to alot of your questions.
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Hesitation is Fatal!!