Quote:
Originally Posted by gtc
If they're thick flange and stainless, they're SSIs.
A photo could easily determine this also.
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SSIs can come in thin or thick flange, with or without o2 bung.
If you're worried about performance differences or something, the Dansk, SSI, and the stock HEs all offer the same design, but the build quality of SSIs is what everyone likes. Performance will be the same between SSIs and Dansk and old stock HEs.