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In an effort to improve our GTO's braking without breaking the bank, we upgraded to DBA 5000- and 4000-series rotors with Hawk HPS pads and Russell stainless lines. The DBA front rotors are PNs 52020BLKSL and 52020BLKSR and retail for $1,056 per pair. They are only sold in pairs. Rear DBA rotors under PNs 42021SL and 42021SR cost $165 each or $330 per pair. The Russell lines (PN RUS692320) added $140 to the cost. Hawk HPS brake pads (front PN HB247F.575, rear PN HB573F.615) cost $70 and $90, respectively.