I ran a STS kit for years, it worked.. with the 60mm turbo and a Yank TT3000 stall there was no lag.

Getting the right sized turbo is the key.

 

Heres a good thread, guy did a mid mount.....2010 base 4.8 truck 2wd mpt76q trim build - LS1TECH

 

rear mounts can make just as much power as front mounts, it all based on turbo sizing and tunning.

the oil pumps arent a big deal they many people have had success with the ebay pumps for $100.

 

Contemplating a mid mount similar to the 4.8L link above on my 6.2L, except off of my ARH 1 7/8" LTs. I wonder if I would have a velocity/spool issue? Any input?

 

It will work fine.

 

Snowmobile turbo systems have their own oil system, a small circulating pump that weighs 5 oz and their own catch tank for recirculation. I was thinking this would be the way to go if I ever did a rear mount.

 

Mark Carlyle's Corvette has the turbo after the Y. It doesn't appear to be slowing him down any:

Fastest IRS Vette EVER and FIRST IRS Vette in the 7's? - LS1TECH

2007 Chevrolet Corvette Z06 - GM High-Tech Performance Magazine

Here is Mark's latest build thread:

When 1800rwhp isn't enough.... What do you do??? - Corvette Forum

 

Didn't work that well for me?? It made a huge difference in spool time and power output when i ditched my coated long tubes and full 3" y-pipe and went with coated/ported truck mani's and a 2.5" primary's merging in to a 3" pipe for the y-pipe leading in to the turbo, you will need a stall if you want it to be responsive, 3-3200k stall is perfect! here is my build thread, make sure you run a good scavenge pump and a 1 psi cracking check valve on the feed line....


https://www.performancetrucks.net/fo...l-pics-478111/


Before stall:

After stall:

 

I've run stock manifolds, midlength headers and lts. Each setup got a bigger turbo, all were with a 408 setup for it. There was no real turbo lag and my last setup (twins on headers) had instant boost on tap, just like PD blower.

Like Quicksilverado said in his posts above -- it will work great as long as you aren't going for max power (e.g. full effort, big bucks). Both he and I were early adopters...

 

It will work, i tried all three also with the same TC78 turbo, it ran the best with manifolds and the downsized y-pipe. Im sure the fact that you had a 408 helps, 408's move some serious amounts of air!. The manifolds retain a lot more heat and have a lot less surface area to fill than the long tubes, the more heat you can retain in the piping before the turbo the more velocity your going to end up with. I hated getting rid of my long tubes since the stock manifolds are so ugly.... it was well worth the swap though. If you run a big enough stall it will fix all your lag issue's with any one of the 3 im sure.