I'm looking for companies that make headers for a square-port 240Z. I've seen what Motorsports Auto, Victoria British, PaceSetter, Arizona Z-Car, and Stahl have to offer. I even found some Nissan Comp headers. I'm hoping to find someone that makes stepped headers (1-1/2" at the flange, stepping up to 1-5/8", then 1-3/4", into 2-1/2" collector). Hooker and Hedman don't appear to have anything. Any suggestions?