Upgrade your tone with the Tone Z Tech Midpipe for G87 M2/G80 M3/G82 M4. At Tone We grew tired of the single midpipe drone and the equal length rasp which is why we are proud to present Z Tech. After months of R+D we have finally created the best sounding s58. Made with high grade SS304 and 3D Printed SS316, the Tone Z Tech midpipe offers a high quality sound from high quality materials.