They may give you a hard time even with the FI. If the dealer is to try to find the reason why you are running rich (which has to do with the info from the intake and various exhaust sensors) they may say, well you have an aftermarket exhaust which may be causing your condition. As you may already know, running rich is bad for your car. Fouls the plugs, bad for your CAT and of course really poor fuel economy.
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