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We are now offering the following Stage I, II and III offerings for owners of the new 3.8L Cayman GT4 and Boxster Spyder. Our Stage I kits are rated from 415 - 430HP depending on exhaust options. Our Stage II kits that include a lightweight flywheel, Guard Transmission LSD and 991 Power Kit installation are rated in excess of 450HP while our Stage III 3.99L "stroker" conversion, when done in conjunction with Stage I and II with race manifolds, is estimated at north of 470hp with substantial torque increases in excess of 20lb/ft at the wheels.
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