Right now I'm making 336 hp with ebcs dp test pipe and a tune. I'm looking to add 1000cc injectors, fuel pump, front mount with hard pipes and intake. If I get retuned do you think I can crack 400+ hp (note it's a mustang dyno) while keeping the torque at a maximum of 355?

Lol...i have almost that EXACT build and heading to the tuner friday. I will let you know what i do. It is on a low reading Dyno Dynamics though which reads lower then mustang.

I'd say you should be able to crack 400 with that list of mods. Why no Cat Back though?

Mustang dyno won't be doing you any favors though, lol