It's a really easy install. And I discovered that the stock plastic grill is easy to reinstall behind the teeth. To install the grill, you line up the 4 tabs on the Slingshot with the slots on the grill, pull the grill onto the tabs, and then slide it towards the passenger side to lock it in. Then 2 screws hold it in place to keep it from sliding back off. The problem is that when you sandwich the two grills together, they are double the thickness so only the aluminum teeth grill will slide into the install tabs properly. So I needed to extend the 4 slots in the plastic grill by about 2 1/2" each, so they'd clear the install tabs. Then I had to replace the stock screws (#10 x 3/4" machine screws) with longer screws to account for the double thickness. ( I used stainless steel #10 x 1" machine screws from Lowe's).
I like the idea of the stock grill still being in place to prevent debris from impacting the radiator.