Build your own
Z1 post tubes
OEM MAF housing cut off of the OEM air box
2.5-2.5" straight coupling
2.5" piping, about 8"
2.5-2.5" 45 degree coupling
More 2.5" piping, about 7"
2.5-2.5" 90 degree coupling
More 2.5" piping, about 4"
2.5-3" reducer coupling
3" piping, about 3"
K&N filter same as stillin
About $200 or so spent. Silicone is better than all aluminium for coolness and where a coupling is, it's slightly bigger inside to run more air. Doubt it does anything power wise but I like it.