Hi guys, I just recently purchased my 2007 400ex. I am new to the forums, and I had some questions about aftermarket exhaust. I cant decide on the best system. I trail ride 99% of the time, so i need it to be 96db or lower to be legal around here. I like the Sparks X-6 Full system, but it is a bit pricey, and i think its pretty loud too. I also am interested in the HMF Performance Full System, but I am unsure about how much power difference/loss there is between it, and the Sparks system. My final thinking was to save some money, buy a HMF Performance Slip-On, and put money into other upgrades as well. If so, what other upgrades are best for trail riding? I know these questions have been asked thousands of times, but I hope you guys can share some insight or advice. Thanks in advance.

Hi guys, I just recently purchased my 2007 400ex. I am new to the forums, and I had some questions about aftermarket exhaust. I cant decide on the best system. I trail ride 99% of the time, so i need it to be 96db or lower to be legal around here. I like the Sparks X-6 Full system, but it is a bit pricey, and i think its pretty loud too. I also am interested in the HMF Performance Full System, but I am unsure about how much power difference/loss there is between it, and the Sparks system. My final thinking was to save some money, buy a HMF Performance Slip-On, and put money into other upgrades as well. If so, what other upgrades are best for trail riding? I know these questions have been asked thousands of times, but I hope you guys can share some insight or advice. Thanks in advance.