slip-on vs full exhaust

I just finish doing all free mods on my 08 wr450(ais remove, air filter,trottle stop).Beside the free mods I installed a FMF slip on, fuel mix screw, did the carb jetting, I think that for now is o.k. since the bike only have 15 miles on the odometer.This is my first 4 stroke (18 years riding 2stroke motocross bikes). My question is that there is a big difference in power between what I have right now and the same I have plus the header pipe( complete full exhaust). btw the slip on is a powercore ti. Thanks Juan

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