Ark Performance N-II Exhaust System (SM1800-0403N) 1461 It features our Polyphonic Harmonizer

It features our Polyphonic Harmonizer and SwitchFire(tm) technology

Includes hot and cold side intercooler piping

Consistent weave pattern with one-piece carbon fiber construction

Every M4 kit we build not only provides your Bimmer with a show-stopping stance

The BC Racing ZR Coilovers use large 42mm inverted monotube dampers

Ark Performance N-II Exhaust System (SM1800-0403N) 1461 It features our Polyphonic HarmonizerThe ARK N II cat back exhaust system offers straight through technology, offset tip design, and large piping diameter. All of this creates a deep, throaty exhaust note while maximizing power output. This is great for high horsepower vehicles, including forced induction applications. The ARK N II is full SUS 304 stainless steel which provides improved looks, durability, and corrosion resistance while maintaining the best fitment, sound, and