Originally Posted by Grizzly
The old Thrush Turbos can't be beat, especially at 28 dollars each on Amazon.

I had them and they were surprisingly quiet, upped my performance a bit, and had a great sound at idle (318 2bbl W150)


Don't put them on anything making any real power. They choked at a bare minimum 50 HP out of my 440, and honestly I'd say it was closer to 75-100, I'm talking HUGE difference on a 550 HP engine. There was an episode of MotorTrend's Engine Masters (after I figured out that these were my problem) where they killed something like 20-30 HP on a 350 HP engine. But man they did SOUND great.

OP - run the longest case you can fit, 20 inches is great. I replaced my 3 inch in/out Hush Thrush Turbos (14 inch case) with 20 inch case 3 inch Ultra Flos and was surprised it is actually quieter with the Ultra Flos which are straight through. The long case makes a huge difference. It also made 479 WHP through the Ultra Flos with a stock stroke 440, so I don't think they are holding it back much power wise.


Last edited by GTX MATT; 11/25/20 01:27 AM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street