Huge difference to my 2008 BMW M6. Changed the rev limiter and increased the power enough to feel it. Highly recommended for the price! I also had a setup question and emailed support and they responded within an hour!
Pros
Easy installation in less than 15 minutes with no mechanical skills required! All power chips come with an installation kit that includes detailed installation instructions with simple step-by-step pictures! Our award-winning 5-star technical staff is on hand to offer advice and help with any questions you may have.