BMW 3 Series Valvetronic Exhaust

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What are Valvetronic mufflers?

The Valvetronic system allows you to switch between being quiet and being loud with the push of a button via remote 

Does downpipe increase horsepower?
downpipe will add “just” 10 to 20 horsepower, that gain is noticeable anytime

Does a straight pipe increase horsepower?
Straight pipe exhaust reduces the pressure on an engine from exhaust gases. This will allow an engine to function better. Straight pipe exhausts can increase both horsepower and torque.

BMW 3 Series Valvetronic Exhaust
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