If your car is NA1 I guess the header would make some really nice gains, on an NA2 the factory header is very good (you can see the difference in just the pictures). The factory exhaust is always fairly restrictive. And too quiet for its own good.
The SOS headers are a work of art very good craftsmanship I have them on my 92 with an ARK-DTS exhaust and there is a noticeable increase in performance. And the sound is great:biggrin:
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