The redesigned PowerBomb is a four-stroke header that incorporates FMFs 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. The 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). Tuned for bottom to mid performance. PowerBomb headers are the front runner in performance headers. Designed for full service access to oil filter. Detailed Specifications: Type: Header. Configuration: Single. Header construction: Stainless steel. Header type: PowerBomb. Note: For closed course competition use only. Not intended for street use.
"Bought this after I smashed the factory head pipe on my CRF 450. Didn't really notice a power increase so speak of. Later, I ended up buying the FMF heat shield as I was getting tired of burning holes in my riding grear. Fit well but had to run down some springs to secure it, as mine didn't come with them and would come loose without. Looks cool."
Decades of racing development went into the design of the FMF Powercore 4 complete race exhaust to improve the power and performance of your dirt bike or ATV at a practical price. The FMF Powercore 4 is a muffler that will boost power and torque throughout the power range, making the Powercore 4 usable for all types of riding. FMF designed a Hi-Flo end cap and core for the Powercore 4 to increase power by creating a free flowing end cap and a core that allows room for exhaust pulse. This results in a consistent power curve. The FMF Powercore 4 uses and advanced cross-weave packing that is more durable then the traditional packing. The cross-weave packing also keeps the Powercore 4 at a reasonable sound level by dissipating the exhaust sound. FMF constructed the Powercore 4 muffler using aluminum to keep the weight down with a stainless steel head pipe and components for extended durability.
"Started out by putting a FMF Power Bomb header on my '06 CRF 450 but I didn't notice much difference at all. Followed up by putting on a full FMF Power Core 4 exhaust on. It mounted easily. It made a very noticable increase in power, much more so then the FMF header did. More significant of power increase when in the lower RPM's if the spark arrestor is out. Louder then stock but not to bad. It's holding up good except for the decals having a tendency to peel back."