I see these items advertised in Roundel and I am curious how effective they are and if any additional mods are required. I would also appreciate opinions on whether it is worth speding the $ without any addtitional work done to my engine. With $ spent on my auto in preperation for Oktoberfest doing tires and brakes, I am looking to see if this product gives me a good bang for my buck.
A chip will make a bigger difference, but usually necessitates the use of premium fuel to achieve the gains advertised. You don't say what car you drive - you may be burning premium already.
