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TPU will probably work as an alternative to a (hard) rubber around room temperature, but it's elastic properties will change rapidly with increasing temperature. A car engine bay will easily exceed 50°C, where your printed TPU reducer will have the mechanical properties of jelly.
Could you use a 3D printed mould to cast the part in silicone?
MrE
Light_EDDed
There’s a 45 degree reducer on my cars engine from memory it’s 35mm to 25mm.
I’ve looked for spares on eBay and silicone options but nothing. I’ve put some heat shrink on it but that’s just a sticking plaster