DetailsThe back boxes come with a loud 4.5” tail pipe or a more subtle sounding one with a 3.5” tail pipe. This comes in 2.5" pipe to fit on to the standard Centre Pipe. Please reply to your order confirmation stating which you would prefer (4.5" shown in picture). This item is made to order. Delivery normally approx. 4 weeks. If you would like a more accurate delivery time, please contact us.