Yes — Master Seller tier with HKS USA, verifiable on their dealer locator. We've held authorized status continuously since 2004.

Yes. Full HKS USA warranty applies. We handle RMA processing directly.

USDM in-stock items ship within a few business days. Japan-direct items typically 4–8 weeks; limited releases 8–12+ weeks. We update you when your order is placed with HKS Japan and again when it ships out.

You can, and people do — autocross and HPDE are fine. For wheel-to-wheel or serious time attack, the damping range and valving aren't built for that use case. Look at Hipermax R for a more aggressive HKS option, or step outside the HKS lineup.

Yes, every HKS turbo kit requires a supporting tune. Some platforms (A90 Supra, FK8) have well-established HKS-validated tunes available. Others require custom tuning. The product page will tell you what's available for your platform.

Under the Magnuson-Moss Warranty Act, a dealer can't void your full warranty just because you installed an aftermarket part — but they can deny warranty on components the aftermarket part affected. An HKS exhaust isn't going to affect your transmission warranty. An HKS turbo kit absolutely affects your engine warranty. Use judgment based on what you're modifying.

Under the Magnuson-Moss Warranty Act, a dealer can't void your full warranty just because you installed an aftermarket part — but they can deny warranty on components the aftermarket part affected. An HKS exhaust isn't going to affect your transmission warranty. An HKS turbo kit absolutely affects your engine warranty. Use judgment based on what you're modifying.

Short version: Hi-Power is the louder/sportier tune, SPEC-L adds a resonator section for reduced drone at the same flow rate, Super Turbo is the quietest of the three and the closest to OEM+ in tone. We have a longer breakdown on our HKS Exhaust Comparison Guide.