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I went for the racechip as I'd used one in a previous car with good results and the £8,000 engine warranty is certainly better than nothing. I'm getting <3.3s to 60 with it which seems to be similar to what the JB4 is advertised to achieve.
I think the JB4 is a good option if you are looking for more customization to eek out a little more power if you have other mods.
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