Yep, they're ABS plastic good up to 180F I believe.
Here's a T for 8 bucks at Wally World
MUELLER INDUSTRIES 03405
These fittings would require gluing a short piece of straight pipe in each inlet so you could clamp a silicone coupler to it. The OD of 3' ABS is 3.5" so you would need to use a 3" to 3.5" reducer to attached to the TB maybe?