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For LS1 in S-10 and Blazer. Very tight fit and good plug access. Includes all hardware necessary for installation. Fits 4.8, 5.3, 6.0 Vortec engines and LS1, LS6, LS2, LS7 1-5/8" Primary Tubes 3/8" Flanges 18 Gauge Tubing 2 1/2" Collector (collector already fitted for 02 sensor) Note most other brands are 1 1/2" NOT 1 5/8"
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