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Originally Posted by Vekke
If I run it all the way to back to the car pipe would weight at least 3 kg more, have 4 tight bends more and I dont think I can afford that with my weigth saving target.
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It looks like it's coming down on the centerline of the car, so it'd need just 1 bend to continue aft.
It doesn't have to go all the way to the back, if you keep it as long as it is now, it's not going to weigh more.
The car's body would be muffling the sound - more if you ever add sideskirts.
And it'd be invisible.
You could have it exhaust inside a streamlined shape that's lined with high temperature resistant sound deadening material. Doesn't need to be metal / heavy.
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Noise limit is 85 dB and I believe its under that by clear margin.
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At work, we were surprised at the noise levels when they were measured with the plant running full tilt, and how easy it is to go above 80 and reach 85.
You could try the serrated edges on the exhaust tip - it works for Boeing
