Aha. I understand now why FEW ppl used themthe compressor is the same only difference is the turbine wheel which means the 35r will spool faster but not have the same top end as the 37r generally speaking. It shouldnt be a massive difference between the 2 unless you go with 3794 or so
I would use a 3582 in this scenarioDepending on the backpressure of your setup and VE of your head/motor combo, having a larger turbine wheel will make you more top end as it increases cylinder scavenging in high rpms where backpressure is an issue. The 3076 vs 3576 made around 30+whp per turbo in top end from some of the testing I saw a couple years ago and almost no difference in spool. I would only assume the same to be said for the 3786 vs 3586. Spool won't be too much different and probably not even noticeable on the street. I would do it if it were my car. PTE, FP, and Garrett and now mix matching TW/CW as they are finding that you can get better cylinder scavenging with a larger turbine wheel on a maxed out compressor map while having near identical spooling characteristics between the two within reason. I'll probably run a 3579 on my build and they should make 1200whp and spool only slightly slower than a 30R but much faster than a 3586! Hope this helps.
the 71-64 is their old 3582 in a better center housing and those aka just about 1200...I don't think the smaller one will cut itIt is Force Performance's new XR65-64 (lbs per min - TW size). If Garrett made it, it would be labeled as a 3579 just for comparison purposes.