If you are going to make a turbo downpipe off a G25, G30, or G35 Turbo, this V-band kit is the move! We have used them for years with fantastic results. Comes with the Garrett specific flange and adjoining clamp!
Straight from Vibrant:
Vibrant Performance offers a complete range of Turbo Flanges for your custom fabrication projects. Each flange is precision laser cut and CNC machined to ensure a perfect fit to your turbo components.
Vibrant Performance modular connections are an excellent alternative to traditional flanged, clamped or slip fit tube connections in both aluminum and stainless steel charge or exhaust piping. Our modular connections have earned the trust of industry professionals throughout the world due to their outstanding quality.