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If you have a GS 300 then you need to buy the one for the GS 300, the GS 400 then the one for the GS 400, 430 for 430. Each model has one specific intake and ECU.
Also, for future reference, topics related to intakes or other performance items go on the "Performance" sub forum at the top of the second generation GS page.
well yea of course cant use them with other engines buuut is their like street version as opposed to a race version or whatever just wondering planning on getting one soon
There are two versions of ECUs. Both are 'street' versions and are moderate tunes to your air-fuel ratios, the race ECU is the newest of the two and is a slightly more aggressive tune.
If you get the older one you can mail it back to SRT (or used to be able to) and get it reflashed with the newer one.