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[Fullsac Performance]

  I had a bone stock 2013 CVO Ultra roll in last week for a basic stage I kit. The proud owner Larry expressed a serious concern for keeping the noise levels down.He explained that he and the wife enjoy casual Touring and were only looking for relief form the heat. An increase in power would be OK but not really as important as cooling her down and keeping it quiet. He had already decided on the DX pipe and was planning on keeping the mufflers stock. After a little more discussion on performance and the relationship to heat reduction, we settled on the DX with a pair of 1.75 cores and perf screens inside the stock mufflers. This is a combination I had never dynoed before.The 1.75 cores are seldom seen at the back end of a DX on a 110" motor. I was really thinking we were going to loose some TQ and HP everywhere in comparison to a pair of 2.0s or 2.25s cores. After running baseline dyno pulls, we bolted on the new headpipe, modded the mufflers, back into the dyno room she went. Very easy mapping session, I was very surprised at how linear and progressive the VE numbers were with the small cores. Final results were suprising too. 100 ft of TQ at 2100 RPM! 110 at 2500 and 114 at 2800! 18 FT increase at 3000 RPM over stock right where you ride. Definitely a TQ monster and no slouch on the big end either with almost 97 HP. Larry came back from his test ride and commented that the sound level was perfect and the power increase was twice what he expected!
More torque early, always a good thing.

2013 CVO Ultra. Parts installed

Fullsac DX Pipe
1.75 CVO power cores.
Perf muffler screen
TTS Mastertune2

Special thanks to Larry Konz of Wisconsin for riding with a Fullsac!  

Steve George
Fullsac Performance

[Mr D]

Another winner Steve 

[FLSTFI Dave]

Wow, that is really nice.

[chiefs584ever]

Steve,

Do you have a dyno run comparing all 3 setups for comparison purposes.  Would like to see the DX Pipe with the 1.75's 2.0's and 2.25's on a comparison to see how much difference in the torque curve and HP.

Thanks,
John

[collis69]

would really like to see also

[Fullsac Performance]

The DX is its own animal in how it responds to the different core sizes. The CX on a 110 did not like 1.75 cores on the low side. As we have just seen,
the 1.75s on a DX make extremely early TQ. The 2.0s, IMO are the best choice for overall power delivery and a balanced TQ curve. The 2.25s
will make the highest peak TQ but also narrow the TQ curve. Yes, you will loose some TQ at 2500. I don't have all this dyno info from one bike,
so I'm not able to show back to back same day same bike dyno comparison of all the cores. Comparing runs from different bikes with changes as
small as this can be very misleading. As bikes come through my shop I'm able to see the trends as different customers request higher or lower sound levels to
suit their preference. With out the dyno, these small performance differences would never be known. I always urge people to choose core sizes based
on sound preference. Its a Touring bike, if it doesn't sound right at the end of a 500 mile day 2 hp will not be very important. Even with the largest core,
your Harley will still have more than enough bottom end torque (and sound) to pull a stray crotch rocket out of a ditch and back up on the pavement.  
I tried to document this, but some guy in a Power Ranger suit got very upset when I tried to take the picture?
Don't over think it, go with what your ears like. Or what your wife's ears like!

Steve George
Fullsac Performance