turbo 4.6

I realized my last post was a little rambly so imma re say it, how bad is the on3 kit? I just finished building my motor for handling 600whp and going to boost it, anyone heard of the ATP twin kit? and is there any alternative “budget” kits better then the on3 kit.

Hello there, I have a 2007 mustang gt with a 5spd and I'm looking to turbo the car I believe. by the summer months I am needing to beat a 2014 Audi s4 that is a 7spd PDK auto, with an intercooler, intake, and exhaust. the car is my best friend and I am thinking He'll be running mid to low 12s...