I already have the Boss 302 splitter installed, but now I am think of changing the splitter to the Laguna Seca splitter. My question is, do I need to remove the 302 splitter to install the Laguna Seca splitter or can I install it right underneath my original splitter ?

 

Looking at the instructions here
http://www.americanmuscle.com/boss-f...tter-13gt.html
It looks like you can just bolt the splitter right under the boss one. But you might need to use the supports that go into the bumper.

 

That link is for the 2013-14 mustang. Sorry if I didn't clarify I have a 2012. Although it looks like the 2013-14 version you can install it under the 13-14 splitter, but I don't think that will fit a 2012 splitter.

 

http://www.americanmuscle.com/boss-f...et-1012gt.html
Looks like you could do the same for the 2012 and just bolt it underneath.

 

No, you remove the base boss splitter and install the leguna seca.

 

You're right, I should have spent more than 30 seconds looking at the page, my bad.