Hi all. I have Gibson cat-back SISO. This bolts up a short ways downstream from the crappy OEM collector and still leaves a length of the small 2.5"(?) OEM pipe for the exhaust to travel through b4 reaching the 3" Gibson pipe. Does anyone know of a readily available collector that will install relatively easy and offer a direct transition to 3" pipe? If you have a similar setup a pic or two would be great!

Thanks!