Cobalt SS Network - 06 Supercharged Tips?

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06 Supercharged Tips?

Hello everyone, new to cobalts picked up a 2006 supercharged with the following alleged upgrades:
Dyno Tuned via ZZP (275hp)
2.9" Supercharger Pulley
"Bigger" Injectors (sigh)
Cold air intake w/ K&N
ZZP Shorty Header
ZZP Downpipe w/ High Flow Cat
ZZP Rotated Trans mounts
New struts/shocks
Powell VV3 Lowering Springs
New Control Arms / Moog Components
New Timing Chain / Balance Shaft Chain
New Guides / Tensioner / Bolts / Gaskets
New Thermostat

Vehicle has 79k miles. I have not seen boost above 15, and at idle -15, feels a little sluggish like it could use a tune up but runs sound. Advice? Cheap easy improvement ideas? Any red flags? And also what spark plugs would you guys recommend? Thanks!

06 Supercharged Tips?

Use ngk plugs. Go one step colder than stock. Im not sure on the part number. Do a little searching and youll find it on here. Clean your k&n filter. Check to make sure your intercooler pump is running. I think all you have to do with a zzp tune is turn the key into the on position and it should kick on.