I have 2 carm extensions one for each of my Leshiy's. They work really well and make it feel much more comfortable than with the original stock. I would recommend it.
I have a brand new FX impact Mia Stu external plenum 65cc. Never been used only installed to check fitment and leaks. Asking $100/obo shipped PayPal 3% or F&F or Venmo.