NP Mike,roughly 2.5-2.75 ID. I'm not sure if theres a company that makes a true 3 inch DP for this kit, probrably has to be custom made. I actually have a Random Technology high flow cat on order, its a direct bolt on between the DP and the cat back and I believe its 2.5 inches ID. I'll find out tommorow cause thats when I'm picking it up. It already has two bungs for the oem o2 sensors all I have to is get another bung welded on for my AEM wideband. The reason im using this setup is for emissions since its pretty tight here and the cops who like to randomly check if its there. My car is fairly low but you can still tell if theres one there or not, or else I'd be goin with a custom true 3 inch test pipe. Btw I already have the skunk2 70mm, now that is one nice ass exhaust. Here's a pic of the Random Technology High flow cat. Now my question for you Mike is where do you think I should install the AEM wideband O2 sensor? Between the first bung and the cat? If anyone else has any input as to where they installed theirs this information would be great.
