You wouldn't see any ballooning on the sort of pressure coming out of our turbos. If you were running at a few hundred psi :shock: you might but not at 15 to 25 psi ! Aren't the Samco intercooler bends 3 ply ?! That's pretty well engineered for the job in hand. However, it's clear that it's best to have as much of the pipe run be steel/aluminium pipe and minimise the use of silicon hoses for joining only. Otherwise you will have constantly changing diameters