tapping/clicking sound from motor

[clean2g]

I have a mostly stock 97 GSX (boost controller-15psi, ACT 2600, bov, catback exhaust). For the past few days I've been hearing some sort of tapping/clicking noise coming through the valve cover. I'm not sure if it is anything but just wanted to see if anyone knew if it was anything? The car has been running a little sluggish lately. I checked the oil level today and it was low but not dry so I filled it up, don't know if that will make any difference.