Buying used peformance parts for e60
 

Is there an major risk or things I should look out for if I'm buying used parts for e60?

looking at a charge pipe, Blow off valve, Intercooler

ETS 5" intercooler for $450 (seller has it on his 335, but I've heard it can be installed on e60)

ER Chargepipe for $175

TurboSmart BOV for $300

Plan to run a COBB tune V3 on it
Are those decent prices?