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Bigger is NOT better for N/A applications. You will lose tons of low-end power if you have no backpressure. I'd suggest between 60mm and 70mm. For N/A SR20's I'm pretty sure that 60mm is ideal but I'm not completely sure. Only go as big as you can if you're also going turbo. Check HKS and Greddy exhaust systems. I'm not sure if they offer a bolt-on exhaust for the NX2000 but you might be able to get an SE-R one on there with some fabrications.
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