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Dump valve + turbo hose in a '89 200TQ 10v

Hi, virtual club!

Have just discovered you guys on Sunday, I am on my second sleepless night 
now going trough the Archives, can't get enough...

Maybe someone can help me:

I have just blown up yet another hose @ 17psi of boost on overtaking a 
3000GT. Since I am tired of spending $64 a pop on the new ones, I am 
considering a dump valve, something similar to the ones used by Audi 

1. My new intercooler has a third hole, which is pluged. It is about 23-25mm
in dia., located in between the inlet and the outlet. What is it for? Maybe 
for a dump valve? Has anyone ever installed it there? Any good results? Does
it really afford a faster pickup on the downshift since the impeller is not 
being back pressured?

2.If I have a dump valve installed, will I be able to replace the @#$%&% 
hose with a metal elbow, granted I will be using the rubber coupling sleeves
cut off the OEM hose to mate it to the intercooler and the throttle body,
and close this problem forever?

3. TAP is selling a rugged silicon rubber aftermarket replica of the OEM 
hose @ $115. It is blue, approx.20-25cm long, the wall must be 5-6mm thick, 
reinforced with thread. It fits a number of cars if trimmed and is probably 
made in GB. Ivor showed it to me @ Watkins Glen in July. Looks impressive. 
Does any one have an opinion? 

4.And lastly, why the 200TQ's 20v also blow them up, even though they have
factory dump valves?

Any reply is anxiously awaited for. 

Igor Kessel,
'89 200TQ, chipped and MOMO'ed through out,
in Tornado "arrest-me-officer" Red;
'88 Fox, "the FOX-machine";
ex '85 5000s, "the EE's nightmare"
Phila PA, USA