then i always get JDM sport couplers, 16-20 dollars shipped, stock throttle is 3.75 coupler size, then get strait, 90, 45deg bend, and 3 or 2.5 inch piping for intercooler piping here is a FMIC and piping kit good for 600-700wheel hp you can get them in all sorts of sizes, couplers, lengths, they come with clamps, couplers, intercooler, use 3 inch at the most or 2.5 inch easier to fit