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JKD03
07-24-2009, 07:37 AM
How much power would you get with a sparks racing big core exhaust? My 400ex is a 2007 and is stock. thanks
honda400ex2003
07-24-2009, 08:09 AM
I would say something along 2 or 3 horse. steve
aDviSol2y
07-24-2009, 08:13 AM
most good pipes you will get 3 or so with a slip on and around 7 with a full set up.