Silencer for BEC Westfield?

[JT71]

Hi,

I'm planning on taking my (newly acquired) Westfield to the track soon, and am pretty sure it's going to fail the dB limit (it's VERY LOUD). What are my options? Do I have to buy a repackable exhaust, or change it completely? Can I interchange cans fairly easily (i.e. put a quiet one on for track days)?

Any help would be much appreciated!