Quote:
Originally Posted by Swedish M3ffia
Do you seriously believe bmw develops and 3500 dollar system that doesnt give you the same torque low down?
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If you know anything about engines, there's no free lunch man. A higher flowing exhaust increases a few HP at the higher (and sometimes mid) end of the rev range, while reducing torque a bit down low. It's very little in both cases, but sometimes the lack of low-end torque is felt more than the increase in top-end HP. Anybody slapping an ehaust on his car knows (or should know) that trade-off, even though sellers claim ridiculous gains 'throughout the rev range'. A simple and legitimate question. And yes, the reason for any exhaust should be SOUND alone, since any gains/losses are minimal.
And the only 'stupid' here is using the word without reason. Ignored
.
By the way, the only way to have the best of both worlds is with valves, which are mighty expensive. But some people (including me), don't like the 'jekyll and hyde' personality of those. And some cars, like the Ferrari F430, lose a tremendous amount of low-end torque without the required back pressure. With the valves open, it's totally gutless below 2K rpm, and still pretty bad below 3K. My M3 feels like a Corvette by comparison. Have to rev engine to almost 2K to avoid stalling it, when on the M3 just above 1K is plenty. But above 3K the M3 feels like a minivan by comparison
. And yes, MUCH prefer the linearity of the S65
.