Parts list-
eBay has the cheapest ones-
2x 3-3.5" silicone elbows
2x 3.5" straight couplers
1x 3-3.5" reducer coupler
2x K&N RC-5000-
K&N RC-5000 High Performance Universal Clamp-on Chrome Air Filter
https://www.amazon.com/dp/B00062YP62..._6OlABbB600704
Oval mandrel bent piping-
https://www.cxracing.com/stainless-s...-VERTIx1-ADPx2
https://www.cxracing.com/stainless-s...-90-OVAL-VERTI
(Notice the first link has the two round to oval pieces... So you'll only need one second 90.)
So everything shipped is well under $400, and then whatever the shop charges you to do it. I'm sure others can accomplish this cheaper, this is just how I did it.