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Dragon just like everything factory, its not extreme. Roots don't stress an engine with huge pressure but do bump it up a bit.
Take for instance the mustang..
The gt500 runs on 8.5 psi but has been show that it can handle up to 14ish reliably.. this is done as an overkill for the warranties.. build it to handle more power than the average person will give it and it will last.. thats why manufactures like roots, they are low pressure, easily controlled, and consistent (ie easy to fuel map).
Edit - Forgot to put in that they are cheap to build too like dgthe3 said
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