It is almost always better to do it yourself than buy used thats been modified
You just don't know what someone else has done or how it was done and they sure as hell aren't gonna warranty it after you buy it
If YOU do it yourself, you pick the parts, you pick the shop, you put the plan together, its all under your control.
This is particularly true when it comes to boost and small things can lead to big problems. It rarely works out where you come out ahead instead of having to spend more to fix ****
obviously if you insist on buying used, you should demand as much documentation as possible and to talk to the shop that put it together and tuned it and make sure these people know what the **** they're doing
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