These DPR EVO 4-6 intercooler piping kits are made from light weight aluminium. They come complete with silicone joiners and T-bolt stainless clamps as shown.
Some adjustments may be required when installing aftermarket intercoolers or intercooler piping kits.

Kinugawa Manual Boost Controller Elbow
Hybrid GT2 spec intercooler kit - WRX (GD V10) 