Originally Posted by Clark Turner
They make the .63 housing for lower flowing engines. The .63 is listed for 1.5 to 2.0 ltr engines. Or if you had two turbos on a V6 or V8 engine, You would want both turbos to have the small 63 housings.
Now that's interesting info
Why twin .63 works better than twin .82 on V6 and V8??