aFe POWER Takeda Stage-2 Cold Air Intake System w/Pro DRY S Filter, #TR-3001P, Polished

What boost level is safe for a stock RB26DETT?

The factory RB26DETT runs around 10-11 psi (0.7 bar) from the stock ceramic twin turbos. Most tuners consider 14-16 psi (0.95-1.1 bar) the safe ceiling on stock internals with upgraded turbos and a proper tune, producing 350-400 whp. Beyond that, forged pistons, rods, and a head stud kit are strongly recommended. The RB26 block is robust; the stock rod bolts and head gasket are the weak points at elevated power levels.

Are wheel spacers safe on a JDM car?

Yes, when they're hub-centric, correctly torqued, and paired with enough stud engagement. A quality hub-centric spacer carries load through the hub just like the wheel does, so it isn't relying on the studs to center. The rules that keep them safe: match the bore and bolt pattern, use longer or bolt-on studs past roughly 15mm so full thread grabs the nut, and re-torque after the first short drive.