Care to share? I knew what I wanted so I didn't have them "design" anything for me. Only suggestion they made was to put an Xforce mid section for my GT-R instead of using their muffler, it was quicker and they it fit properly onto my existing cat back. Years ago when I got my R31, I called them up to book, rocked up on the day, told the guy what I wanted, waited a few hours as they were busy, got a finished product for $350 (2.5" mild steel cat back, two mufflers, mandrel bent).