What plugs are missing from the HF engine harness that the Si engine harness has? What has to be added? Or is it a direct bolt in swap? What else do i need? I dont need to change the hubs do i?

 

A little search won't kill next time. Anyways HF harness is almost the same as the si, excpet it has extra plugs for egr and something else (don't recall), so you can reuse your hf harness without mod. You can keep your hf knuckle and hubs only if you're using the hf tranny, if not than you have to change them. Other than that direct bolt on.

 

Nope you can use the si trans with hf axles. Inner cup is the same its the outer on the si that is different. Direct bolt in. Dont bother with the hf trans its garbage atleast get a dx at the least

 

yep, writing owns me meant to say axles instead tranny