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Racechip v JB4 for a '19 540 w/M package (if that matters)
deciding on one or the other. both are 50hp upgrades, allegedly. racechip is about $80 cheaper just not sure which is (a) better and (b) easier to install - both should be fairly simple. Anyone else gone through this that can offer advice? my car is a lease but I'm one of those "I don't care, I'm doing it" kind of guys... thanks!
or...do I go with BM3 (bootmod3)?
Last edited by dlf750; 04-07-2019 at 07:07 PM..
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