made much of an output characteristic in not only a style but also medium- and high-levels turn area and developed ARQRAY / center pipe.
By a combination with Rear Muffler, foolishness and sound of exhaust from
middle speed area change.
for BMW E60 M5
for BMW E46 M3
The exclusive design that chose pipe diameter, the shape that I matched with displacement volume every car model, an engine characteristic!
