If that is the Zex brand I know that Chico ran that on his GT and do not recall hearing of any problems -- but keep in mind that his GT was exceptionally well-modded and built to withstand some major hp and torque
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"120k and still going!"
Silver '02 SE with the "wee 'lil" 3100, raised spoiler, custom-made cone intake, dual exhaust catback, u-bend delete
04 GTO Impulse Blue Metallic, LPE intake system, headers, dyno tune from "RPM"
http://photobucket.com/albums/v221/Dobermanjt/GrandPrix/