our Dport LB project is in the "foundry pour" in a Wisconsin foundry at this time. We should receive LH castings in 2 weeks and RH castings in 3 weeks. As this project has evolved the design too evolved. Our dport LB, while externally are exact as originals, internally they have longer runner dividers and terminate in larger collector 2.5" i.d. Our work on a 3" dport has been put on hold until the completion of our 2.5" DPort. Re-evaluation of our plan for a 3" collector dport will occur over the next several months. If you need to move on your project I'd encourage you to select the 2.5" dports. Give a call when you're ready and thanks for your interest and patience. Paul at RARE