Akrapovic Honda MSX125 / Grom 21-25 Optional Header (Stainless Steel) - E-H125R2Offering an impressive increase in power of over 10% and a huge weight savings of 48% over the stock item, the header provides increased tuning potential when used with the Slip On Line (Titanium) exhaust. It is constructed using high grade stainless steel, has a thread for the lambda sensor for those planning to tune the engine electronics, and has no catalytic converter. Power is increased by 13. 6% at 8,600 rpm, with torque increased by 14. 7% at