B Series 4-1 Narrow Header B16 B18 B20 RMF RF

304 stainless steel A/C and P/S compatible Suitable for all B-Series engines, B16, B18, & B20 Suitable for 1.6l - 2.0l engine displacement 2.5" collector outlet 4-1 merge collector Includes gaskets and hardware 1 Year Warranty De pending on the engine setup, slim fans maybe required. Not factory length, you will need an extension pipe (https://jackspaniaracing.shop/products/3-way-slip-fit-adjustable-telescoping-test-pipe-2-25?keyword=test%20pipe) 2-piece design, combined with the 4-1 collector delivers the best performance.