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Shimming 4A-F head

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Hey guys i setup a date my toyota dealer down here to get my head re-shim, port and polish and i'll change the stock exhaust manifold and put on 4-2-1 extractor found on the ae92 fx corolla GT or if i get 4-1 extractor. so if you have any ideas for me just give me reply.

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· Country Hick
2001 Nissan Pulsar
2,017 Posts
4-2-1's are useless really, unless you got 2 cat converters, then go to one. Gives you slightly (VERY slightly) more power if you do it that way.
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