Are eBay silicone radiator hoses any good for a Mazda RX-7 FD?

There is a general warning regarding cheap online silicone components: when discussing eBay intercooler couplers, it was noted that cheap silicone can cause "tons of problems down the road," though some builders have still had success shopping around for specific pieces ².

If you are looking for known silicone radiator hose options for your vehicle, there are a couple of specific alternatives available:

• RX7.com Hoses: These are built as an exact copy of the original Mazda hoses to ensure a perfect fit. They are high-quality and typically run between $79 and $95 for the upper and lower set ¹.
• Godspeed Project Hoses: This is a budget-friendly option, typically priced around $45 shipped. They are made from 5mm thick, 4-ply reinforced high-temperature silicone and are rated for pressures up to 128 PSI and temperatures from -65°F to 350°F ⁷.

A Note on AST Hoses: If you are planning to replace all your coolant lines with silicone, be aware that there are no direct-fit aftermarket silicone hoses for the Air Separation Tube (AST). To use silicone there, you would need to route reinforced straight hose carefully so it doesn't kink, potentially using a spiral stainless steel wire insert to help it hold shape. Otherwise, it is best to stick to the OEM Mazda rubber hoses for the AST ⁴.