Constructed from premium stainless steel, the Akrapovic Optional Stainless Header Pipe E-H125R2, combined with the Titanium Silencer Slip On Kit S-H125SO4-ASZTBL, provides an enhanced full system for the greatest possible weight reduction and power increase for your Honda. The Akrapovic Optional Stainless Header Pipe E-H125R2 yields 10% more power and reduces weight by 48%, providing improved power, torque, and improved handling. Power is increased by 13.5% at 8,600rpm and torque by 14.7% at 8,700rpm. This part can be used in combination with a slip-on kit, enabling further tuning of the engine. Constructed from high-grade stainless steel, it also includes a thread for a lambda sensor for optimal engine optimization. This upgrade is crafted with a refined aesthetic and expertly engineered to produce a notable deep and sporty sound, a hallmark of Akrapovic. Installation is effortless with included fitments and a step-by-step instruction manual. This straightforward mounting eliminates the requirement for fuel adjustment or ECU reprogramming. This pipe does not contain a catalytic converter, thus rendering it solely suitable for track and closed-course circuit use. It does not satisfy emission regulations for road and highway use. Compatibility This header set is compatible with the following motorcycle models: Honda MSX 125 Grom 2021-2023 Performance Data Unit Stock Akrapovic Max gain Max. power kW 6.6 / 7300 rpm 7 / 7500 rpm + 0.8 / 8600 rpm HP (m) 9 / 7300 rpm 9.5 / 7500 rpm + 1.1 / 8600 rpm HP (i) 8.9 / 7300 rpm 9.4 / 7500 rpm + 1.1 / 8600 rpm Max. torque Nm 10.2 / 6000 rpm 10.5 / 6000 rpm + 0.9 / 8700 rpm lb-ft 7.5 / 6000 rpm 7.7 / 6000 rpm + 0.7 / 8700 rpm Weight kg 1 0.52 - 0.5 lb 2.2 1.1 - 1.1 % - 48 Product noise dB 80.9 / 3625 rpm 91.5 / 3625 rpm 10.6 Inst. time min 40