Are they worth it or has anyone ever considered them?
I know they work good on both petrols and diesels and they reckon they u get better fuel economy and an increase of power

Just wondering on what people think of them

They have and they did net more power. Not much but it was around what they are claiming. It was a good 8 years back when I read it so don't ask me to find it.SUBYDAZZ wrote:Couldn't be more skeptical - Why aren't car manufacturers using them?
Wait until a well respected auto or performance mag does a test and see what the results are.