Id have to say try the MSR 1005 pipe best pipe going IMO novas love it so do O.S so just try it



Mugen MSR 1005 Pipe (MSR1005)
The Mugen Seiki Racing 1005 pipe is designed for .28 engines, and broadens the powerband of these engines and provides great run-time and smooth throttle response.
This pipe also works very well with many .21 engines, including the N21B, VSpec, and P5.
Pipe includes 2 coupler grommets, springs, and setscrew.