Silicon hoses and flanged tubing can be expensive, especially when you add the magic word "motorsport" to the vendor's name.
I used 2 pieces of ordinary 38 mm (1.5 inches) aluminium tubing when fabricating a custom top hose.
This worked fine, but I really wanted to have that same pipe flanged at each end to make an even more secure fit.
ASH (autosiliconehoses.com) seem very competitive on price compared to a lot of suppliers {half the price in some cases!!}. They also supply many other useful parts.
http://www.autosiliconehoses.com/
Buy online from ASH here:
http://www.apmotorstore.co.uk/
This is my joiner (100 mm long x 38 mm):
http://www.ebay.co.uk/itm/ws/eBayISAPI. ... OC:GB:3160
The company's ebay shop is here:
http://stores.ebay.co.uk/Venair-Perform ... 4340.l2563
Nice quality items at a decent price.