JayCee's new billet stack for the IDA Weber. Made from Billet 6061 aluminum, these stacks are one peace (no welded flange) witch makes them stronger and thicker. With no modifications, these "bolt on". These are the tallest stacks available. With a flow increase of 21 CFM over stock and the inside diameter is 3.5mm larger then stock IDA stacks. This stack also complements our original dust covers at a additional price. Sold individually.