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The "best" exhaust completely depends on what machine we are talking about. For the 400ex, the absolute best full system exhaust is the sparks. For the trx450r there are several top names, but FMF unfortunately is a terrible pipe for the trx450. hmf, sparks, dasa, rossier, are all top pipes for the trx450r. As for slip ons, you're not going to see huge power increase so there are generally very little power differences between slip on pipes.
 

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My vote goes for HMF Competition series. Combines performance, looks, and sound adjustability with the 3 inserts which is huge in my opinion.
 

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Thread Killer ^^^^^ lol
 

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Thread Killer ^^^^^ lol
Lmao^^^^^^^^ I personally run FMF but for a 450r DASA. . . 400 Sparks, lexx, HMF

DG is short for Don't Get. Seriously. . Their bullet series is ok. . The megaphone series is total crap
 

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400ex sparks racing best exhaust by far
 

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I like my supertrapp pretty well on a 400ex
 
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Craiglucas
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