i got my letter in the mail the other day too . i had mine changed when i bought my car from the dealership but i am going to the local gm dealer now to have them do it just to make sure it is done correctly .

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1998 GTP , 3" down pipe w/cat , u-bend delete , full 3" exhaust w/ magnaflows , no resonator , powerslot front rotors , Overkill PCM , Overkill FWI , 180* t-stat , 1* colder plugs , alt. re-wire , alt. stage 1 booster . 215 whp and 238 torque .