Hi Quick,
Do you want to go aftermarket or Genuine?
The genuine cone type ones work really well on the harleys, up with the vance & Vines pipes + the race tuner.
I'm not too sure what tuner you're using, but the genuine race tuner is definitely the way to go (Part number 32109-08B off the to of my head)
Is yours a softail/Dyna etc?
I know the chrome heavy breather cone kit is a 29299-08 in chrome for 08 up softails, and 29080-08 for dyna, but obviously would need to clarify it.
You can go the Pro-V hypercharger which is a little better than the standard one, but in the end there's nothing really better.
You can get the Cosiar-V aswell, which Kuryakyn also make. There's alot to choose from.
We have a new set of air filters with different chrome designs which are pretty good from Roland sands, but it's all what you're looking for.
If you call my work (03) 97917722 and talk to our chrome consultant get some answers. I work at Peter Stevens Harley Heaven in vic, deal with them all day every day haha.
If you don't ring, let me know what year bike and what model exactly (flhtcu, fxdl,fxsts, etc etc etc) and I'll have a look. But the genuine one has proven best.