Hi, This fits a Chevy Geo Nissan and Suzuki year range-1999 to 2007, manifold converter to Front Pipe, between Front Pipe and Rear Converter attachment. The product dimensions is 6 x 6 x 1 inches. The thread size is not given anymore since fitment selection of your year make model submodel and engine size would confirm it. On the homepage, please enter your application, simply select your vehicle’s year, make, model, sub-model, and engine size and click “Go.” Once your application is selected, type the name of the part you need on the top search box and press enter. Once the part shows up on your screen, you’ll see a “Guaranteed to Fit, Direct fit” note/badge if the part will fit, and we recommend that you also double-check your vehicle fit details as well as the vehicle fitment information table on the product page.