They look, sound, add power and perform better than anything on the market.
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This system was an amazing and easy system to instal and as happened my exhaust up a lot and has made it much funner to ride plus its is very very durable with what i put it through which is a lot
I put this slip on dual system on my 2013 CRF450R and noticed a low end to midrange increase in power right away. The pipes look awesome and installation was easy. I run these pipes with the provided inserts in. Very happy with this purchase.
The FMF Mega Bomb Header is made specifically to fit only FMF exhaust systems, FMF slip on Mufflers or the OEM Muffler.
The Yoshimura slip-on would just fit onto the OEM head pipe.
I would recommend looking at the Yoshimura RS-9D Full Exhaust system if you were looking for the headpipe and these mufflers.