I would like to know everything that I can buy to get more HP for my 2004 cross fire and where to get it from please help me this is very important to me I seen a kit that gave you around 80 HP it cost about 1500$ and I can't find it now

 

And I doubt you ever will.
All that's available is :
upgrade throttle body from 68mm to 74mm - about $50
Cold air intake - from Needswings - $369, DIY around $100
Eurocharge tune - $300 when on sale
and that's about it.

 

All that and you will not see more than 195 hp at the wheels if you have a good engine to start with.
Look at the results published on here by guys who did all that. Valk did a thread on it.

 

I saw unicorn horns for sale somewhere but I cannot find the ad. I know they are rarer than hens teeth but I cannot find that ad either.

 

If it's that important, you might consider going with a Nitrous Oxide system.

https://www.carid.com/mercedes-nitro...=Mercedes-Benz

Gets you up to a 75HP increase.

Certainly significantly raising the HP puts the engine components at risk.