so do these really give more hp and better performance or would u have to get other things like ECU i/h/e to feel the gains? also i heard these things can mess wit ur i believe it was timing belt or timing chain or watevers?

 

Nope, nothing really measureable. But they are are dress up item though...

 

someone told me they weaken electrical, like the light will be dimmer and stuff liek that.