This is the part I recommend when you need to make a Silver Streak or Blue Streak shoot better than new. It transfers air better than the OEM part. When I need to replace an exhaust valve body I use this part in my Streak rebuilds that I sell on eBay as "cforestctree". By the way, if you have any issues or questions about a part, don't hesitate to contact Heather from the JG website. She usually gets back to me quickly and is quite knowledgeable about parts and their substitutions including revised numbers on old parts.
John York