I am about to pull the trigger on springs, I was looking at the FRPP K Springs, but then noticed they have FRPP N Springs for the V6. What is the difference?

Also in consideration are the Roush springs (3/4 inch drop). What do you all think?

 

Thread hijack (sorry): Those of you with the FRPP springs, did you need anything else?

 

I had the frp springs on mine and just took them off, I liked them fine but they were to low for my side exhaust kit. my back springs were on for 2 hours my front were on abouut 5 months. You can see pictures with measurements on my cardomain.com site search ybnormal-gt. they were easy to install only took a couple -three hours. you do need a tool you can rent from most auto parts stores, to compress the springs in the front. you will love them, didn't seem to hurt ride. if shipping wasn't so expensive Id sell you mine. you also need some metric sockets jacks and a stand but read taco bills how to guide on here (they are all excellent).
I am running 19 inch 295s on back with no scrubbin any time. Like I said I just put steeda springs which are not as low. exhaust issues.
As far as what else you need? a front end alignment and make sure they get the angles right
the frp kit comes with 4 springs and 2 boots.