Blue Very Hi Temperature Silicone Rubber Wet Exhaust Hose, 8.00 Inch ID, Up To 20.00 PSI

Rated for up to 350 degrees F continuous, so sustained hard running is well within its range. The silicone construction also gives it roughly six times the service life of most standard rubber hose, and it backs that up with a 10-year warranty. As long as the water injection point is far enough upstream to keep temps at the hose location within that 350-degree limit, you're in good shape for regular hard use.