A
From what I understand you want a .8x size housing, here is a post from earlier in this one. But the Tail housing might be different. If it was me I would run the .86. I know mine pulls hard and is very responsive. minimal lag.
Internally Wastegated Turbos I like:
.63 or .86 on the m7
.86 on the m8
.86 (ported) on the m1000
I know some like to squeeze the sleds down by using a smaller A/R. They spool awesome and pull great but remember they hold more heat (higher pipe pressure) and they shrink your tuning window. They squeak much easier and faster. I like to keep my tuning window broad and keep my heat down. This is why I leave them a little on the safe side. I tried the 1.06 on a m1000 and it was a dog..... Way too big... so I use the .86 and port it to loosen it up a bit....
Now externally Wastegated Turbos is where is gets fun and more complicated!!!!!!!! I have played with this on my m1200 turbo quite a bit. I think Pure Logic really likes this set up because it gives you tons of adjustability and tunability..... you are able to squeeze the sled down with a smaller A/R and get that snappiness on the bottom and with the external you keep your tuning window wide and your heat down on the top. But you have to have everything sized correctly and have the right springs... blah blah... you can pull your turbo out of its efficiency range pretty quick if your set up wrong... You have to know what your doing with these.... There are tons of different combinations, sizes, spring pressures, pipe pressures etc....you can mess with...
If you want it simple and easy use an internally wastegated turbo and spend your time on clutching to make the sled spool faster and pull harder...
Or buy an external from Pure Logic or someone that has them figured out and your clutching will be easier to figure out ...
Or if you like to mess around like me.... Go for It!!!!
