sounds like you’ve been reading the packaging verbatim. $1000 is a good bit of money, but it’s a small amount when it comes to making HP with a car.
as everyone else has said, the big power numbers would come with FI. for $1000, start with header, intake, exhaust. i don’t know much about it, but i believe the venom is a piggyback that just dumps more fuel into the engine. i don’t think you should waste your time with that. i may be wrong about that as i don’t know anything about cougars.