Shimming 4A-F head - Toyota Nation Forum : Toyota Car and Truck Forums

TRDemon · 08-12-2004, 09:04 AM

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.

TRDEMON

thespud · 08-12-2004, 09:08 AM

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.

Flashmn · 08-13-2004, 06:29 AM

4-2-1 has its advantage, one of which is the fact that if you hit the downpipe on something, you can replace that part of the manifold, instead of the whole thing.