Underdrive pulley and 74mm throttle body from 1999 996 will get you a bit more noticeable gain, less belt noise and more intake noise too, what I did on mine.
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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