InlinePRO M-Series Head Studs - 17+ Civic Type-R FK8 K20C1; 18-22 Accord 2.0T K20C4 - HSK-K20C1InlinePRO M Series Head Studs are 11mm beam diameter (compared to competitors 9. 5mm) for stiffer clamping force. They feature 6 point nuts & hardened washers. The M Series material has been race proven by InlinePRO and is able to handle 1000whp applications. Fitment: 18 22 Honda Accord 2. 0 Turbo K20C4 17 21 Honda Civic Type R 2. 0 Turbo K20C1 FK8 Also confirmed to fit K20C6
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