Advise please Options

[6G96GT]

I got 180K (close to it) on my engine. I already did the head, full exhaust, SRI, full tune up with good stuff, and new 02 sensor. Is there anything else I could replace to bring back some life to my engine like say fuel injectors, rail, fuel pump, fpr, etc?? Would it be worth it or not to replace those fuel parts? They do have all that mileage on em.

[presure2]

you can have your injectors cleaned, i recomend injectorservices.com they do them for ~13$ ea.
cheaper than rc engineering, with the same services.
you get a before and after printout so you know exactly how bad/good they were/are.
whats your compression like?
chances are than the losses your feeling are more in your head than anything else, unless the motor has really been abused.
when you say "good stuff" for ignition parts, i assume you mean OEM parts?(other than plugs)
make sure all your grounds are clean and attached well.
you could also look at your suspension, things like worn wheel bearings and what not will also cause more drag which will affect performance as well.