Im fitting my snorkel at the moment, I took the pipes off 1 by 1 to check they are air tight, first put your hand over the inlet manifold, it should suck hard then stall,
then put the top intercooler pipe onto the manifold, put hand over, it should collapse the pipe then stall, then fit it to the top of the intercooler, now do the same at the bottom of the intercooler, again it should stall, and so on and so on!!
Every pipe I fitted had tiny holes in, so I wrapped them in self vulcanising rubber I got from work, now 100% air tight, the last test you can do is stick a bin bag over the top of the snorkel, all the pipes should suck flat and the engine should slowly die!!
