• 4000 Series HD variant
• Smooth, OE-style rotor finish
• Popular for controlled race divisions requiring a stock appearance
• Same core 4000 Series performance technology

4000 Series Performance With a Stock Look

The 4000 Series HD variant features a smooth OE-style rotor finish, giving drivers who want the genuine performance benefits of a 4000 Series rotor without the drilled or slotted appearance some racing classes don't allow. That combination is especially popular in controlled race divisions where rules require a stock-appearing rotor, but where the underlying metallurgy and cooling performance still need to hold up to real competition use. It's the same DBA 4000 Series engineering underneath, just without the visual cues. It's the kind of upgrade that quietly does its job without ever needing a second thought.

The Same Core Technology, Just a Different Finish

Underneath that smooth finish, this rotor still uses the same high carbon alloyed iron and Thermal Stability Profiling as the rest of the 4000 Series lineup, so there's no performance compromise for choosing the OE-style look. It's a smart option for anyone racing in a class with rotor appearance restrictions, or simply anyone who prefers a cleaner look through the wheel. Real performance doesn't have to come with an aggressive appearance. That's real, functional engineering, not just a marketing claim.

Straight From Subispeed

A smart choice for 2003-2012 WRX / 2004-2012 STI in a class with rotor appearance restrictions — full 4000 Series performance in an OE-style finish.

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