Fully programmable ecu will solve all you issues and create some cool new ones like the need to start upgrading cams n shiz.
I'm feeling that your limiter problem is the common speed sensor cut, do you know if your car has an electronic speedo or a cable one?
If it has a cable the ecu will freak out because it doesnt have a speed sensor reading, and the only way to fix this on a stock ECU and using stock instruments (dash) is to either run a speed sender to the ecu and have no speedo. Or do a dash swap and use the AE111dash cluster that has a electronic speedo.
Of course you can also get around it by doing the sensor install and just run a aftermarket/external speedo to the one in you twincam cluster, but it would look messy.
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