i was having a look at wai's tial wastegate with the v-band flanges and clamps...

damn they fit well.. also very easy to put together and take apart no welding required.

vyper if i was you bud dont skimp on it, 06 STI you might aswell put away a couple extra dollars and ya set dude...

i am sure also if your installer is good at what he does there shouldnt be any problems. keep us updated