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" stacks will increase flow by a 21 CFM over stock. 3-1/4" high. The inside diameter is 3.5mm increase over the stock IDA stack. The larger stack also complements our original dust covers at a additional price. Also available in a 1" shorter version which sits the same height as a stock IDA stack. Sold individually