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Not worth buying unless your engine is heavily modded - the higher the power the bigger the regulator required + you will also need bigger injectors. You cant just fit one and make it go faster if ya catch my drift
Your cars already got one, unless you need a new one your old one should be fine.
I got an uprated one to sort out the AFR as was out slightly and wanted it ok as i had to wait a while for a ecu to sort it.
There are probs more benifits but wont be seen till you modded more as matt black said.
Cost about £60-120 i think
You wont see any performance gain from this alone imo.
Someone will prob be along to give you a better understanding soon.