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I did 2 dyno runs before and after mods. (archive)
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Posted by Black M5 on January 28, 2001 at 16:44:40:

In Reply to: Dyno Machine should compensate for heat and level. posted by Evan...(more) on January 28, 2001 at 11:59:24:

I did a dyno run last year on my M5 and the figures i got was:

Max. power = 333.8
Max. torque= 331.3

I beleive the lost percentage is 18% hence 333.8 *1.18 = 394 bhp.
I have now rear mufflers and K&N air filters plus no cats. The figures now are

Max. power = 343.0
Max. torque= 342.5

343 * 1.18 = 404 bhp. A 10hp increase verfied by the dyno.

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