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Intake, exhaust, header are probably easiest, and cheapest in that order.
I have an HKS exhaust, and it is nice and quiet.
I've heard many different opinions on things like pulleys, etc. Personally, my feeling is that since basic bolt-on's don't really offer all that much power on a Celica, pullies aren't worth the risk/reward. I/H/E are pretty safe though. I've heard talk of things like grounding kits and all that, but I can't speak to them - some of the other guys here can likely give you better advice.
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