When my sled was stock, I put a slp can on. The only thing I really noticed is that the throttle response was a bit crisper, but not a huge difference. It was a little louder than stock but not bad, much lighter though, that's the biggest advantage. Sorry, don't have any experience with the speedwerx.
When I bought my sled (used) it had a BMP can on it. Fit was horsesh!t and that's a compliment. Sold that can and bought an SLP can. The fit on the SLP can is AMAZING. It blocks off the exhaust outlet very well, is lighter than stock, a little louder than stock when on the valves but not obnoxious. Haven't noticed any bog at all. No experience with speedwerx, but they also make nice stuff.