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Originally Posted by Scotty89
I have had JB4 for a few months and not had one engine light or misfire.
I replaced the coil packs and spark plugs at the same time I installed Jb4. Everything else is standard including air box.
I would get JB4 as it's cheap, reversible and provides other features not in a flash tune (code reading, safety map, gauge information etc). You can resell it if you don't like it. You can't resell a flash tune.
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What he said. Unless you're really penny pinching or you're a proper DIY guy, just get it supplied and installed by a good workshop as it will be supported. Have owned my car for a month and got my JB4 from Active. They seem OK.