I would stay away from the JP-4 unless you don't mind spending more. I know some will argue over this till the cows come home but for the most part the difference in the pipes I have listed is not much really. Yes the claim better bottm end or more top end but for the most part its not a big difference. I would probably get the ofna or dynamite 086 out of all of the one's I have listed. But thats just me.