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I watched a video from engineering explained, he mentioned how if the pipes are too wide, you'll lose exhaust velocity but have low back pressure. The idea he said is to have the right amount of exhaust velocity and back pressure.

The takeda Axel back advertises a 9 hp gain. The takeda exhaust with age midpipe advertises about an 11 HP gain. So like two more horses from their midpipe over stock? Just trying to make some sense here 😸
 

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That guy from engineering explained has his ideas together. For turbo cars you just want all the exhaust out of the car as easily as possible. The turbo itself is typically the highest contributor to back pressure felt by the engine. Next is the catalytic converter. With turbo cars all that matters is the ability to move volume easily from the turbo back.
 
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