From my local market spec sheet:
IS300 1550 kg (3417.107 lbs)
2JZ-GE, 2.997L, 24V VVT-i I6, 213PS (not sure how that converts to US hp)
IS200 1420 kg (3130.511 lbs)
1G-FE, 1.998L, 24V VVT-i I6, 155PS
Not sure about suspension, but I heard somewhere that the IS200 and IS300 share the...