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S13SRiding,
For SR20s, Nistune is always a cheap and reliable solution since it will retain all the factory ECU funtions. You can check the pricing on their website. AEM EMS is also good and with AEM you will have a lot more features such as lunch control, flat shifting, map switch and etc. But as bcrdukes mentioned, it's always best to get all the modification done, before tuning.
Last edited by RacingGreed; 02-20-2012 at 12:54 AM.
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