Can you replace a D15B8 with a D15B?

Yes, you can replace a D15B8 with a D15B, but there are some considerations to keep in mind. The D15B8 typically has different tuning and specifications, so while it may physically fit, you might need to address potential differences in performance and compatibility with other components. It's advisable to check the wiring, ECU compatibility, and any required modifications before proceeding with the swap.