ls1plus Posted October 11, 2021 Report Share Posted October 11, 2021 New in box Speed Engineering 1 7/8" headers, multi layer gaskets, and y-pipe. Decided to go a different route with truck. Including link and can send pictures if needed. New in box. Never installed. https://speed-engineering.com/products/silverado-sierra-1-7-8-longtube-headers-2013-4-8l-5-3l-6-0l-6-2l-m2 Spent $500. $350 obo for everything. Quote Link to comment Share on other sites More sharing options...
Not Brian Posted October 11, 2021 Report Share Posted October 11, 2021 O2 extensions? What's the diameter of the Y-pipe collector? Quote Link to comment Share on other sites More sharing options...
ls1plus Posted October 12, 2021 Author Report Share Posted October 12, 2021 I don't have 02 extensions. They are available on their site. It is a 3.5" exit and comes with a reducer if on a 5.3 with stock exhaust hookup Quote Link to comment Share on other sites More sharing options...
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