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Quantity
1
Description
Description
Gains are 80whp/100wtq on pump gas and up to 150whp/175tq on higher octane or E85 mixtures.
The ultimate tune for your S58 powered G80 M3 and G82 M4, the JB4 allows you to go from factory stock to full race, and everywhere ...
Reviews
5.0
1 rating
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Superb performance
I’m extremely satisfied with this product, I get on demand performance without compromising my warranty or reliability. A+++