| program .. I used to have JWT ...best thing I did was sell it ..detonated my Z and cracked a ring landing years ago .. the JWT chip is good for a stage 3 Z IMHO .. once you starting really moding a car, you will need a AFC with a JWT. With the JWT, if you modify the a/f curve it will change the timing to compensate ... you will / can lose power right there .. also JWT does not use a safety map (of course if you run a boost controller ... it doesnt matter )
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