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02-05 WRX Modification Minimum Recommendations

Most 02-05 WRX's by this point either have a lifetime of mileage, or are on their second or third motor. I highly recommend ensuring that all the basics are covered. Here is a list of common issues I see with 02-05 WRXs that come in for work or tuning:

In general, you want to minimally have the equivalent of a fully functional stock vehicle BEFORE you start modification.

From there, here are my minimum recommendations based on approximated power goals. Each list is inclusive of the list prior.

Stock Turbo Level (TD04 ~250whp max)

Mild Turbo Upgrade Level (VF, 16G or similar ~300whp max)

Moderate Turbo Upgrade Level (18G, 20G, Dom 1.5 or similar ~350whp max)

Reasonable but not required upgrades

For power levels in excess of these I recommend direct consultation in order to help you tailor a setup to your needs. Upgrade paths can diverge depending on specific requirements.