I've seen a couple performance shop who have had this sign hung up in their showroom/office area where they meet with people. It read: "Cheap, good, and powerful.
You can pick any two."
Why? Because you can buy parts that are cheap, and make good power, but more than likely they aren't good because something will break very soon. You can get a powerful system that is well made and reliable, but it will cost you some money. Or you can get cheap parts that are good, but you aren't going to get much power from them.
With that out of the way, a Celica GT-S is 11:1 compression (maybe a tad higher even) which is bad for turbocharging. You have to be very careful with turbocharging that engine or you will blow it up, and the parts available to do so, are not cheap. Blitz makes a turbo kit I believe for it. So might another one or 2 companies, otherwise you will have to fabricate it yourself. Either way, a moderate turbo setup can gain anywhere from 50-75hp on that car, at an expense of roughly $4000 or more, including tuning. I would personally figure out what you want to do with the car first before spending that kind of money. Do you just want to make the car faster than it is stock for cruising around on the street? Or do you want to race it? If you're going to race it, what kind of racing? That car is great on autocross courses and road courses due to its light weight and well set up suspension, and I'd imagine a turbocharger would greatly upset that balance, being a front wheel drive vehicle.
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