Sarge, The Air cleaner plastic pipes on the HENG LONG Body are held in place by clamps that can be unscrewed by carefully unscrewing the Phillip headed screws in the clamp tops, They are tiny and don't look real but they are.
If the Taigen Clamps are the same then just loosen the clamps and you can work the pipes free, they are not glued in place. If the clamps can be unscrewed do take great care not to round off the soft metal headed screws as you do it,
If the Clamps are glued in place then gently I SAID GENTLY work the pipes loose,
If you are happy taking the body off of the Hull then I would recommend you use a debonder to remove the glue on the clamps bases on the inside of the Tank body and replace the plastic clamps with metal ones which you can tap a thread on, and then its just a case of loosening the nuts when you need to remove the pipes in future.
The replacement clamps cost pennies, although I made my own using some threaded 1mm rod and some off cut 2mm plasti-card cut to shape.
The Pipes and the shafts that holds them are very tough and you have no need to worry about breaking them.
Something that might start you swearing is that the inner plastic pipes are not the same length as the outer ones,
Shaun.