It's the manifolds too isn't it? Perhaps there's a few urban myths about turbos, but they create a lot of heat and can cause problems unless designed to cope with it.
Turbos don't creat heat, it's the exhaust gas that drives them that's hot, the turbo stays hot cos it's a big chunk of iron on the turbine(exhaust ) end, the other end if aluminium cos that's just compressing air, the bit in the middle is lubed by engine oil, smokey exhaust means oil is bypassing bearings or piston rings in the bearing housing and getting into exhaust, no big deal at least u know it needs attention.
The biggy is if it get no oil, cos u don't change it n it's like tar, this will snap the shaft, smash impellers, and either fill oil or air side with debris, n prob stuff your engine
Cant see how manifold affects that unless bolts won't come out
£70 to £80 for parts n rebalance of shaft, thats important!
I build em :-) and tonight I'm ballancing them on 1 of 2 £200,000 machines we have, so they don't shake in bits at 100,000 rpm