yh i was thinking the same i dont think you can tune them as much enless you spend tons of cash on em but iv herd they aint all that anyway but they do have a alright top end iv defo been in 1 that went 135mph and im sure he only had a few mods

but good luck with your saff im currently working on mine
https://passionford.com/forum/album.php?albumid=928