I just changed out my exhaust, air intake, and Fuel mgmt on my 950T.
First let me say my "stock" setup had the stock pipes' baffles drilled out. The stock intake had a K & N filter. No fuel management. I got tons of backfire on deceleration with this setup. That setup had all the power you would want and then some. But it didn't have the sound I wanted.
So I put Cobra Speedster Slashdowns on first .(yes they fit great on the 950 tourer despite what Cobra says). Now the sound was right.
Got the Cobra Powerflo intake in a few days later and installed it. Unfortunately I noticed NO difference in the sound or performance. Pretty disappointed in that. Basically spent $250 for nothing.
Next I added the Cobra Fi2000 fuel management module ( a real PIA to install) and the backfiring went away.
In all honesty now that all three components are installed I noticed a slight decrease in performance. Nothing earth shattering. I actually like it somewhat. The bike is not as squirrely as before. Before I barely rolled the throttle and I thought it was going to pop a wheely. On deceleration, if I rolled off the throttle too quick it was like I slammed the brakes on. Now with the fuel management installed that has all smoothed out somewhat.
I think the stock 2 into 1 exhaust does add to the performance of the bike.
If you want to keep your stock exhaust & intake, but beef up your performance, then drill the baffles out of your exhaust and put a K & N filter on and you will see a nice improvement. It also sounds better and isn't too loud.
Hickory North Carolina
2012 V Star 950 Tourer