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Just wondered how I could increase the cars bhp? Any ideas welcome thank you

You 325ci is powered by a I6 2.5 N/A engine with 184 HPs its someway far to be a powerful engine, small mods may help but not to the point to reach the stock 225 HPs from the 330ci, if you have some good budget you could install a turbo kit on it and be around 275 HPs.

You can use a car performance simulator to virtually tune your car and run performance test to see how the car would improve in real life, try at http://www.nxgtrsim.com