The OFT istself does have a problem with the catted headers its just that the off the shelf tunes supplied are for stock header or catless header, their is not a specific tune for a hi-flow catted aftermarket header.
for best results you would need to tweak the supplied tunes yourself or get shiv at openflash to do a custom E-tune for you for about $200 for OFT users.
It just depends which system you want to go with the overall results will be similar
OFT plus custom tune $500 plus $200 custom tune
Ecutek plus custom tune (if they dont have a flash and go tune for speedfactory catted header) $350 ecutek licience $300 flash and go tune plus $xxx for custom tune if needed.
looks like these guys may have tune for you
http://www.ft86club.com/forums/showp...2&postcount=38
Ecutek you get map switching on the fly but tune is locked and its extra money if you want/need cable to flash the tune (about$400).
Tune and licience is locked to car only cable could be onsold (if you buy one) or need one if you cannot get to ecutek tuner.
OFT no locks to ecu or tune, you can reflash log , big gauge display tuning alerts ect all included. whole system can be onsold at minimal loss if required
talk to the ecutek guys and the OFT guys work out your pricing and what you want then make your decision depending on what you want and require.