My son and I ran Nitrous in his S/G 11.90 index Volkswagen last season for the first time. A 70HP shot was good for one half second off our ET by using it in third gear only. We ran a best of 11.11 ET by using a 70HP shot in second-third-forth gear. Like you, we needed someone or someplace to get us started in the correct direction with the selection of parts. I'm sure that there are many knowledgeable places around but you will not go wrong by contacting Nitrous Supply in Huntington Beach, Ca. The owner of this business originally started NOS company, and retired and sold it to Holley. He got bored and opened Nitrous Supply with some of his original employees and they really are a "no BS" company. They have run Nitrous on every kind of race car/boat/dragster/ETC you can name. We are very pleased with their advice, service, products. John Palmer