These were cut from the OEM airbox -- they are the correct diameter for accurate MAF readings and the factory MAF sensors will mount perfectly to them.
Perfect for a custom intake project (mine didn't work out -- but if someone else wants to experiment, now is your chance!)
Will sell these as a set of 2 for $50 shipped OBO
Make it $125 OBO shipped, and I'll throw in 2 K&N air pod filters with couplers (model #RX-4870).