i'm finally getting my raptor. just wondering which it better of the two and whats there differences besides the E being disc system. are there any advantages or disanvantages of either. i will be getting one of them cause i get them for real cheap. thank guys.

 

if i were u i would get the e-series pro meg because it puts out more horse power and i for get y disc silencers are better. oh with the discs you can add more discs for more horsepower and make it louder. and can take discs off to make less horsepower and mor quiet. with the e -series u can tune it how u want it. the r-4 is a cheaper version a little less hp and for people who like round looking canister pipes rather than the oval-e- series.