i'm looking at a forge splitter or this one guy told me about hyperboost.
i was about to buy it until he told me, does anyone know which is better or has a better sound?
and will it screw up anything with my engine or mapping?

 

Installed Bailey DVs at 74k miles when I chipped the car and they're still fine at 140k. Should have no affect on mapping -- they're just heavier duty than stock. I never noticed any difference in sound.