Engine and Tune

GSS138

So car is at about 56K, never been tuned, basic catback exhaust, HFC's and CAI.

Seems like car is not as "zippy" as it was(although my track times continue to go down lol). Besides the basic concepts and parts, I really don't know much about servicing an engine. Was looking for some good advice on what you would do if you were me at that mileage etc. Car is 80% track usage, hopefully by next summer will be a track only car.

Here's what I am thinking of doing, please feel free to expand or say "nope that's dumb waste of money", "as long as you are doing this, you might as well do ...".
1. Spark Plugs.
2. Clean all air intakes, manifold, suction line, K&N's, anything else?
3. ECU TEK (need to fix syncro rev) and get a basic tune.
4. ???

Never dynode car, no idea what whp is currently. What would you do next and why? All thanks in advance!

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Current Mods: Vorpal Weapon +5.