5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
Torque, it'll make your car louder, and give you a little gain in HP, i did it around the same time as my air filter, so i cant tell what gave a bigger jump... Its a nice, cheap mod though. (total cost, 3 bucks in dremel cutting discs)
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