My forge hoses are held in with couplers but then the actual silicone hose sits behine a lip on the alloy coupler with a jubilee clip which holds 27-28psi without problems, ive seen an airtec twincooler kit for a mk5 golf gti it also has couplers that go into the stock intercooler and into the plactic boost hoses then the silicone twin cooler hoses are held onto the alloy couplers with jubilee clips surely it will hold under pressure, i might give forge a call tomorrow and see if the tdi twincooler has same couplers and hoses and 2.0T a3 twintercooler, worth it if i can get it at £150 as rrp for airtec is £440