Do they make the same hp and tq? Any differences at all besides the price? Do you need an ecu reflash to take advantage of them?

 

I am wondering which is better, spacer is the direction I am going with the Z AAM you can fit 1/2 inch spacer and keep your stock strut bar but you have to shim it to make it work. Now with Motordyne 1/4 is max for Z unless you use the Hood spacer which raises the back of the hood(I dont like). I havent seen any stock dyno yet but the spacers are made differently so there has to be some difference in hp.I know you want have to have a ECU flash for just this product, your ECU will correct itself after time.