HMF Exhaust for TRX 400EX/X is available as a Slip-On and Full System in the Performance series. The Slip On exhaust picks up 10-15% more horse power and torque throughout the power curve. The Full System adds another 5-10% more horse power. The mufflers will be roughly 4-6dB louder than the stock exhaust, but the Quiet Core can reduce that 2-6dB. Free spark arrestor with each exhaust ordered!
