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The two improvements that I made to my 91 240 sedan were to add the IPD HI Flow exhaust system and change my transmission fluid. I cruise at high speed on the European autobahns (my car is an American spec)so needed a bit more power. I noticed a considerable difference when I installed the IPD Hi Flow exhaust system. The car seems to cruise more comfortably at 90 MPH, and has better acceleration also. Changing the fluid in the transmission seemed to give me chrisper shifts and just makes it seem to run smoother. These are both easy jobs well within the range of an average DYIer. Good luck.
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