We we bought our srt 4 the salesman told me that it has a black box that they could go back and see the last 20 minutes of history on. The srt 4 is a '05. I'm not sure if my '04 srt 10 has one on not.
With just a rear cat delete and a sct tune the truck will feel like a beast. Traction will be a problem. The '05 you test drove might have had old or bad gas in it. The '05 and '06's have knock sensors that will pull back timing. The weather does play a big part in performance also.
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