1-7/8 Primaries x 3 merge collector w/investment cast spear, investment cast TIG welded flanges, stainless steel construction Features: Bolt-In Compatible with Hooker P/N 9722HKR For Nissan LS swap exhaust system 1-7/8 primaries and 3 merge collectors are optimally sized for stock LS2/LS3/LS7 and hot LS1/LS6 engines Compatible with LS engines coupled to T-56 transmissions(LS F-body and GTO) not compatible with automatic transmissions Optimized bend geometry for fantastic spark plug/wire and vehicle component clearance Compatible with stock bellhousing and Quick Time™ bellhousing. Stainless steel material that looks great, retains heat equal to ceramic coating and boasts long product life Collectors are tucked close to floor panels for fantastic ground clearance and longer product life Fuel lines can remain in the OEM location if so desired. Compatible with full-length Hooker stainless steel exhaust system for this application Dual compatibility with other Hooker and Sikky swap components TIG welded flanges for optimum structural integrity and premium looks CAD designed investment cast flanges and collector spears designed to increase velocity and attenuate turbulence CAD/CFD designed 3 one-piece formed merge collectors 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. For racing use only