I ordered from various places and ebay, but after ording the 24" straight piece I found you can get all your piping from them for under $75 shipped.
http://www.courtesyparts.com/sr20det/index.html

This is where I ordered my 45 elbow and silicone from.
http://intakehoses.com/Merchant2/mer...egory_Code=SC4

I found the 6" silicone to be a bit short so I will be ordering a 10" section. Found one on ebay for $47 shipped
http://cgi.ebay.com/ebaymotors/ws/eB...MEWA:IT&ih=024

The filter was purchased off ebay for $50.

I also purchased the short bend radius off ebay, but it was the wrong color and size.

So I am going to order a Spectre racing 3"to3" shortradius 90 and it comes with two hose clamps. Part# 8791
http://www.spectreperformance.com/#CATALOG.8791

So like I said depending on your materials and cost, it will run you $200-$225, plus a little more if you get it powder coated.