35hp gain from the dyno headers, peak to peak......... but almost 50hp@6800.
On that motor, with the dyno headers....... it was 13hp better with the adapter & 1050/4500 than a good ported 850 on a 1” spacer.
I also ran the 1050 on an M1/4500 with no spacer. That’s actually what went in the car....... it was basically the same as the M1 4150 w/the 4500 adapter.
