Complex sentence: The 325 took over from the market position of the 323 and uses the same 2.5 L I6 engine, however the 325's engine has improved double-VANOS and fully dual pipe exhaust system.
Split into simpler sentences: The 325 took over from the market position of the 323 and uses the same 2.5 L I6 engine. However, the 325's engine has an improved double-VANOS and fully dual pipe exhaust system.