RPM's are dropping fast all of the sudden?

[subiesmakemerallyhard]

So i pulled into school today, and my girlfriend was waiting in her car, she said my car sounded "terrible". A sound i cannot seem to notice myself..
my cars been bogging down recently and on occasion i just have no power when i want to accelerate. This morning after my car got warmed up and i took off for class i went to shift into third gear and my rpms tanked. Of course I've been compensating for this RPM drop all day.
I have no clue as to why this is happening. I am worried i should not be driving when i got so much to do this week.

I imagine the sounds she heard may be due to an exhaust leak, or vacuum leak. When i sat and rev'd the engine i had some popping like it was straight piped and was shooting flames.

only mods are a 3in turboback exhaust from cobb.

[DownforceTom]

Is it tuned? What's the mileage?

[subiesmakemerallyhard]

61k, i am unsure of the tune. Ill take a look through the service records, i got it with 44k on it in november

[subiesmakemerallyhard]

blast! no service records. So im completely unsure on the last tune it had.

[DownforceTom]

Give it a minute & people more knowledgeable than I will meander in.

[IGOTASUBARU]

Sounds like a boost leak to me. When did this start?

[subiesmakemerallyhard]

Right, and its hard to notice the loss in power. I only noticed it a couple times, recently this week and a month or so ago. Inconsistant boost makes sense there. Would a boost leak only show some of the time?

[IGOTASUBARU]

Depends. Under normal driving is it ok?

[subiesmakemerallyhard]

I have only noticed it while under normal driving conditions, when i want to get up to speed quick like in a race, there's a tug or yank at 5k rpms. So i have been babying her for a while, driving at the recommended speeds for each gear. I'll go take her for a spin and see if i can get you guys some better insight.

[IGOTASUBARU]

Ok. Under the hood check all your lines.