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im planning to buy another lx9 for my new cav swap. i want to get 1 with grand am style exhaust manis and a forged crank. wat year do all 3500s have forged steel cranks and wich platforms had crossover style exhaust. thanx if any can help me out. the first one i got was from i belive a malibu and had the other style exhaust so im using 3400 manis and if ima get a new motor wanna get as many parts as i can.