I was just wondering what bolt on's can you do on a 91 accord before you need to upgrade the ECU? I assume you are safe with a header and a short ram intake, but how about a mild cam, throttle body mods, or even a turbo without a lot of boost? any info you all can provide would be appreciated.
The only time you need to is when you start modding the internals of the engine such as cam(s), high compression pistons, turbo, supercharge, etc. Basic bolt-ons doesn't require it, but if you want to, you can.
It all depends on the owner what he wants to do.
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