Originally Posted by bimmerjph
Why aren't they true duals? Isn't that what it comes with originally? I know the E46 and E90 had them.
Original stock (OE) ones are also "Center" single large exhaust unit.
We kept the similar design style as "OE" unit but have reduced down the weight "significantly".
Also for the pipe diameter, stock uses 83-85mm Pi, when we have used 90-94mm pi to increase the exhaust
"flow rate" to its max for this vehicle (N55 335i).
We got an absolutely stunning result out of this exhuast so far.
We couldn't be further pleased with its sound quality (Agressive and CLEAN sound)
and also with performance gain we have seen so far. Very Awesome !!