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Since you have gotten no bites on this in over a week I'll offer an opinion. Basjoos vented his exhaust in the stock location and faired in the muffler. I would suggest that is all that's necessary. IMHO the volume of exhaust gas is minimal compared to the airflow around a vehicle at highway speed. That said, it may be slightly better to exhaust to the bottom and out the back than to the side like some vehicles. May as well add some hot gasses to a low pressure area even if the difference is too small to be measured.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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