hmm... this is an easy DIY... discussed a long time ago... u can use aluminium sheet to replicate de original surbo..
or u wan easier... u can use the PC fan blade (3") cut the center part into a hole then stuck it inside de rampipe.. we call this air twister..
my car is using dual air twister for a long time... click http://khguan.fotopic.net/p11505315.html to view the pic
good luck n happy DIYing!!