Order a set of ported/polished/ceramic coated stock headers with a high flow crosspipe from GimmSpeed and send your stock headers back to them for a core charge refund. Minimal down time, easy install, faster car, retain signature Subaru boxer rumble, prettier engine bay... problem solved and then some !Thumbs Up
If it is good build up, just a quick wire brush should do. No point trying to get it all off. If you're engine cleaning, look into a product by P21S called Total Auto Wash. I can't recommend it enough.
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