Kyle (kbracing) sells them. If you get the s475 with the 83mm turbine, I believe you can get them in either t4 or t6. Just ordered a t6 75/83 1.10A/R for my 4.8.

 

thanks!

 

Hard to answer that. If I was towing something, I'd see boost under 3k. Downshifting from a 40mph cruise it would see boost by 6000 or so. But it took forever, either way.

Its a de-stalled Circle D 1A. I was blowing through the regular 1A with the old 6.0/s475 setup, so I had it brought down. Supposed to be something like 2000-2100 stall rating... You will like that turbo. Chevyboy.520 has that turbo on his 5.3, and it ****** scoots for an ECSB. With a good tire/launch its an easy low 12s truck on 10psi.

 

Same turbo on the 5.3 in my brother's car. Starts coming on around 60% throttle and 4000 rpm. Sure it's laggy, but pulls like a freight train!

 

Im gonna start with the stock torque converter and see how the big turbo does.. gotta take a lil while to save up for a stall.