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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)

 
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#1 (permalink) Old 12-31-2004, 08:16 PM
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Although I do not own a BMW I would like to ask a question about one. I know someone who owns a 1988 E34 525i manual. Its a single cam injected 2.5L that has an output of 126kw. The owner wishes to place either a 2 and a 1/4 inch or a 2.5 inch pipe with a sports muffler from the cat back leaving the cat and headers stock. So starting from the catalytic converter there would a larger dimater pipe and a sports muffler. Would there be noticable improvments in power and torque? What would the new output be around? If combined with a high flow filter and a chip what the expected power rise to??

CHERRS!!
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#2 (permalink) Old 01-01-2005, 10:08 AM
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he might lose some low end torque and gain some top end. Also, did u say 125kw - does this mean hp? If so, it's probably much higher than that. he should be pushing at least around 160.

There IS a replacement for displacement - it's called volumetric efficiency
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#3 (permalink) Old 01-01-2005, 10:50 AM
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get a Tri-Flo exhaust from BavAuto and a BavAuto chip programmed to work with the upgraded exhaust... I would say at least 15 hp and 15 tq throughout the whole rpm range.

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