Cheap easy HP gains?

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Originally Posted by shadrach74

If you install headers, you will need to have your ECU flashed to ROW specs; if you don't, you're engine will throw a CEL for the catalyst (or lack thereof). Australian cars are delivered as ROW cars from the dealership, so they don't have that problem.

Also... Colo has emissions laws that mirror Commiefornia's so it may not pass smog inspection with headers/ROW flash. No smog, no tags.