Plain and simple, its loud!!!
Just dont put a ribbed pipe on it or youll increase the noise level.Your better off using the stock pipe, its a good pipe and as far as i know its the most quiet one.
If you need to convince someone then i suggest bugging your dad for it.Go to
www.beatyourtruck.com and look under beatings, there you can show him all sorts of crazy videos and he will see that most ppl who have one are his age.Maybe you can eventually convince him to get himself one and tell him that it could be a father n son hobby.I know it may sound corny but parents almost allways fall for the underlaying guilt factor.
Anyways just dont whine for it or youll never get it, make a deal with them at the worst but in the end GET THAT SAVAGE you wont regret whatever it cost you...