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I got a good CAI set up , ls6 manifold and headers/full exhaust on my 99 6 speed convertible . What would be a good next mod ? I don’t want to change the gears .
I'm a fan of installing mods coincidently with doing major repairs that are due (if any). For example, if your balancer is in poor shape or nearing it's end, I would consider a medium/mild cam upgrade + oil pump + front main seal because you're already there. That's what I did at least. I was obsessed with getting a cam, and you would benefit since you've done other bolt-ons to benefit for better pumping efficiency. But your goals and what you like is key of course.
I had a 150 wet shot with an ECS mail order tune on my 2001 Auto w/ headers and Vararam intake before going with a supercharger.
A good used wet kit and 10lb bottle can be found on here or LS1tech at around half the cost of new. DIY Install was not any worse than HID headlights. I didn't have any gadgets like a remote bottle opener or bottle heater on mine. A bottle heater would be nice because after 3-4 sprays on a 10lb bottle I could tell there was less bottle pressure and the "hit" is a bit weaker, but I heard wiring one up was a nightmare. I just unhooked the bottle and gave it a hot water bath if I knew I was low and planning on spraying.
I went through about 10 bottles in year and a half or so at around $40-50 a bottle. No track sprays, so I'm not sure if you'd go through more/less than that. 150hp is the most I'd go, just have ECS get you a mail order tune for a 150 wet shot and have fun while you save up for a supercharger kit!
I have a supercharger. They're great for street use, less awesome for track use unless you're willing to commit full-bore to all the supporting mods. We still don't know OPs goals beyond "more power."