What mods next? 97 cobra vortech s/c

97 cobra, whats the NEXT mod i should get? I have 97 cobra w vortech s/c 8 psi vs-1 and flowmaster exhuast, stock h pipe, and tremec 3550 tranny, stock 3.27 gears. I am wondering what would be the next best thing within the 300-400 $ range to add to my performance most efficiently and effectively while being a great daily driver still.

I was considering:

1: Mass air flow meter. Maybe one out of a lightning? or pro-m? or c&L

2: High Flow H-pipe or X-pipe whats a good brand with a distintive sound?

3: 3:73 gears? 3:55 gears?

4: Fluidyne radiator? or other high flow radiator?

5: Upper Lower contol arms?

What would u add to it? let me know what you think. thanks.
also i hear a tappity ticky type sound that happens when I hit throttle down past 50% its somewhat subtle it come from one side of the engine so im hoping its probly just a header leakage a little bit where it connects to the Cats. Let me know do you think theres other sounds of technical engine problems that sound like this?
 
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