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
![Twisted Evil :twisted:](./images/smilies/icon_twisted.gif)
Just wondering on what people think of them
![Question :?:](./images/smilies/icon_question.gif)
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.