Ok im looking to get an f-con. I saw this one on ebay. I am using a j-spec with j-spec ecu in my 89 GXL. Engine is s5 also. I am going to put a RB full exhaust system on this engine, now I wasnt sure if I would need this deviced tuned or no. What are the advantages/ disadvantages of this FEED chip being in the PFC? Will I need to have it tuned and the ROM re-writted to use in my turbo engine? Will it need to be taken out? Any help would be appriciated. here is the item link http://cgi.ebay.com/ebaymotors/ws/eB...tem=2448390794

 

I have a HKS F-CON for the S5 for sale. Includes all the wiring, boost sensor etc. I have the standard HKS Chip in it I believe. $250, let me know if you're interested.

 

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