hello, I have a 2006 yfz 450. I don't think anything has been done to the motor, I may think it had a top end rebuilt as there are wiseco stickers on it but I don't know If they were put on there looks. I was wondering what is the best sounding and performing exhaust for my yfz, I want something really loud but yet still a noticeable gain in power and im looking for full exhaust not just a slip on. I was looking between fmf megabomb header with fmf titanium 4.1 or a full Curtis sparks big core exhaust. I understand the sparks is louder but which one has a better sound? also I am wondering which mods are best for speed yet the motor is still reliable. I drive around several hours a day so it needs to be safe. I was first doing the oil update since they had problems with that but I was thinking some hot cams, I was thinking stage 1 since I don't think they have stage 2 for these but also a new airbox setup and eventually ported and polished heads but what do you guys recommend for exhaust and mods? I was also wondering about that zip tie mod if I don't have to worry about it or its completely safe cause I really notice where it bogs at first crack in throttle and my last question is if I get a new exhaust if the header will still glow red or its just from the factory metal? thanks for the info, help and replies!