1-7/8 Primaries x 3 Collectors, 3/8 Thick TIG welded flat flanges, Silver Ceramic Coated Mild Steel Features: Bolt-In Compatible with P/N 9722HKR For Nissan LS swap exhaust system Compatibility with either Holley or Sikky swap components Collectors are tucked close to floor panels for fantastic ground clearance and longer product life TIG welded flat flanges for an optimum sealing surface Black painted coating fits any budget Compatible with stock bell housing or Quick Time™ scatter shield which allows for a safety upgrade if so desired Optimized bend geometry for fantastic spark plug/wire and vehicle component clearance Only accommodates LS engines equipped with T-56 transmissions. Can NOT be used with 4L60E/4L80E automatic transmissions This swap kit is also compatible with the Canton Racing oil pan developed specifically for use with GM LS swaps into the S13/S14 For Nissan chassis. When used with the Canton Racing oil pan for the S13/S14 For Nissan chassis, use of the factory front sway bar can be maintained. 1-7/8 primaries and 3 collectors are optimally sized for stock LS2/LS3/LS7 and hot LS1/LS6 engines