400ex exhaust recommendation

Here 2 help said:

I raced with the stock exhaust and the guys with the open exhaust had no advantage over me. Their machines made more noise, used more fuel and broke down more often. Loud is not fast and for my money, the only exhaust I found to be an advantage over a stock muffler was a SuperTrapp. It could be tuned to the engine and could be loud or quiet. I accepted the volume based on the Dyno results. NOTE: I never changed the exhaust on my 2004 CRF250X, I raced hare scrambles and won my class (over 50) in 2005, unfortunately my age caught up with me - I got 2nd place in 2006 and 3rd in 2007 - in 2011 I turned 60 - my last race on that bike was 2015 at age 64 - I am now 72 and while I still have the bike, I only race for fun. I have physical limitations (no cartilage in my knees, cataracts and lack of stamina) that limit my ability to be competitive to about 35 to 45 minutes. A typical race is 2 hours, but the machines with big bores, loud exhaust, high lift cam and other 'performance' enhancements have no advantage over my factory stock engine - the modifications I did make were to the suspension to improve handling suited to my riding style and for protection of critical components - a bash pan to protect the engine, radiator guards and braces, a shark fin to protect the rear brake rotor, changed the sprocket ratio to suit my demands, bark busters on the handlebars to protect levers, hands and make it harder for the bars to be bent and the greatest modification of all; fork seal saver fork boots. While the seal savers have been replaced several times and the fork oil changed yearly, the fork seals are the original ones. Spend the money on the suspension instead of the exhaust.

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Here 2 help said:

I'll take a look at what price i can get the stock. From the way I understood it you will only see a performance increase from your aftermarket exhaust if you change your air filter and rejet the carb.
Once you,ve done all three your engine can then push through more fuel and air thereby giving it more power although never a very big increase but may still be noticeable. Otherwise stock will be just as good or better.

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Here 2 help said:

I raced with the stock exhaust and the guys with the open exhaust had no advantage over me. Their machines made more noise, used more fuel and broke down more often. Loud is not fast and for my money, the only exhaust I found to be an advantage over a stock muffler was a SuperTrapp. It could be tuned to the engine and could be loud or quiet. I accepted the volume based on the Dyno results. NOTE: I never changed the exhaust on my 2004 CRF250X, I raced hare scrambles and won my class (over 50) in 2005, unfortunately my age caught up with me - I got 2nd place in 2006 and 3rd in 2007 - in 2011 I turned 60 - my last race on that bike was 2015 at age 64 - I am now 72 and while I still have the bike, I only race for fun. I have physical limitations (no cartilage in my knees, cataracts and lack of stamina) that limit my ability to be competitive to about 35 to 45 minutes. A typical race is 2 hours, but the machines with big bores, loud exhaust, high lift cam and other 'performance' enhancements have no advantage over my factory stock engine - the modifications I did make were to the suspension to improve handling suited to my riding style and for protection of critical components - a bash pan to protect the engine, radiator guards and braces, a shark fin to protect the rear brake rotor, changed the sprocket ratio to suit my demands, bark busters on the handlebars to protect levers, hands and make it harder for the bars to be bent and the greatest modification of all; fork seal saver fork boots. While the seal savers have been replaced several times and the fork oil changed yearly, the fork seals are the original ones. Spend the money on the suspension instead of the exhaust.

Click to expand...