Bolt-ons hp question

Z370Z011

Hey guys, sorry f this question has been answered. I tried researching but disnt really find out exactly what i wanted.

Anywhoo, i added some short tails to my car. (They were free from a friend but the i heard that they loose low end power. Would it really be ENOUGH to make a difference?? I got so paranoid about it that now i think my car really is slower. Lol. But the stock resonator is so heavy, wouldn't the loss of power compensate from all the weight taken off?...
And if it does loose torque, what would be good bolt ons to add some more torque? Without having to add a supercharger or turbo. I hear the stillen g3 adds high end.. Anything out there for some good low end torque?

Again, sorry if its been answered. Ive been working 16 hour shifts lately. its been a little difficult to find the research.

Thanks everyone