It's a direct bolt in. Same electrical and hose connections. I wasn't running lean but wanted to run stacked. I have a 178 crank pulley and installed my 65 mm Code3. It was so lean I never got to redline and took it off. With the Pierburg and putting the Code3 back on the AFR's came down to 13 up top with the same tune. It helps is all I can say.

Les