Replace your stock couplers or use any of these couplers when creating a custom project.
The Northstar throttlebody to MAF coupler is 3.75" straight
The "LS4" couplers are intended for LSJ Cobalts/Ions that install the factory LS4 throttlebody. It is a 3.25" to 3" adapter coupler. Generally the Cobalt uses the 45° and the Ion uses the straight coupler.
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