I think that on pre-'99(?) cars the walls of the plenum are not as thick and don't allow you to remove enough material compared to the newer plenums, but you can put a ported '99+ plenum on your '96-'98.
If you call Ben Alameda Racing there is a message saying that they don't take cores anymore because of all the 'unusable' cores they received. Because of this it now costs you $220 to buy one from them.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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