The redesigned PowerBomb is a four-stroke header that incorporates FMF’s patented PowerBomb module at a precise location in the initial stage of the header. By positioning this “Bomb” at a key point in the system, increased performance and flow is achieved through the expansion and contraction of exhaust sonics through the system. Result is a flow increase of nearly 10%! The outer chamber in the Powerbomb allows the air to expand, cool and ramp back up at a higher velocity.
Additionally, the PowerBomb is a “pre-muffler” of sorts which helps to lower the bikes sound output by providing more sound absorbing surface area for the sound medium (exhaust gases).
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Apparently the newer model KLR headers already have pretty good flow, but I have nontheless still been very satisfied with the powerbomb. I've had this on and off the bike numerous times for rebuilding and havent had any issues with it. By itself its actually very compatible with other muffler systems. Just make sure you wipe off any fingerprints on the header before you start the bike after install.