https://stunthanger.com/smf/engine-set-up-tips/stalker-engine-reviews/

Stalker .46SE – I first put one of these on my 53 ounce, 575 square inch P-51C Profile designed by Pat Johnston.  Previous engine was a Double Star .54 turning a 12 x 6 Brodak prop.  This combination won many Profile events over a three year period.
     The Stalker .46SE was mounted by drilling new mounting holes and using threaded inserts.  With a tongue muffler (Brodak/Big Art muffler for an OS .35S) the balance point remained the same.  The tank is a 6 ounce Sullivan plastic, set up with two clunks, one for the feed, a shorter one for Uniflow venting.  The prop was the same Brodak 12 x 6 as used on the Double Star.
     The .46SE pulls the plane at the same power level as the Double Star .54.  There is, however, an “outside burp” on wingover pullouts and at the bottom of an outside square loop.  It keeps on running, but was a little unnerving on that first wingover!  I’ve learned to ignore it, and won Profile at the Spring Huntersville, N.C. meet in this configuration.
     I also have a Stalker .46SE in my 48 ounce Nakke (600 square inches) Classic model.  Based on my experience with the Stalker .40RE, I first added a couple of head shims to the .46.  Flying proved that this softened the power too much above 45 degrees, so they were removed.
Depending on the temperature, I’ve run both 5% and 10% nitro with excellent results.  Most recently, I won Nostalgia and Classic at the 85 degree Baton Rouge/Zachery, LA. Meet using 10% nitro Sig 4-stroke fuel (18% all synthetic oil) with an 11 x 6 Brodak prop.  I’m not finished trying props, and I felt the 11 x 6 didn’t load the engine quite enough.  I will try cut-down 12 x 6 props next.  The muffler is a Brodak/Big Art tongue with the holes drilled to 1/8 inch.  The plane would be nose heavy with the stock tube muffler, even though it is quite light.
Conclusion:  The Stalker .46SE is better on a non-profile model, but acceptable on a profile.  Power is on par, at least, with a Super Tigre .46 or an OS Max LA .46, with a very traditional run.

The ABC S Tigre .46 gets bigger ports as the window / dividerrs for the RING are eliminated , So thought to be more powerful . Tho betting on horses / dogs , depends on whos betting .
Seems to much castor & varnish is a Stalker ' issue ' . if there is one .

So it'd seem the Stalkers a 4-2-4 set up Vs the OS wet 2 .  Horses for courses perhaps .