Why would you want to put a 99 GT intake on your car? Its the same material as your intake now.
But yes is will bolt up but the intake ports on the heads will be different then the intake. The wiring will be the same but Mustangs use 1 coolant temp sensor while your car has 2 (one for the PCM and one for the guage) So you have to hook up the other one somehow. You will need to use the fuel line off your car because on mustangs they have a returnless fuel system. EGR's are the same on both
People only use a 99-02 intake when they do the PI head swap. There wont be any performance gain. If anything, you would want a 02 intake because it has a aluminim coolant passage in the front.
Well..lets see how to explain this. I have an alumnium intake where the TB is at the back of the enging. Reason I say its a 96 rather that a 95(like the car) is because I just bought a ECT (the second sensor you spoke of) and the 1 for the 95 was wrong. They had to look a 96 to get it right.(FORD dealer..you have to watch them) What should be done about the extra fuel line that will be left over. The only reason I want to use the 99 is potientaly better flow/ and easier intake tube fabrication. Not to mention the material should transfer less heat and weigh less.
But yes is will bolt up but the intake ports on the heads will be different then the intake.
Will the ports not match up or are the 99 intake ports bigger?
As far as the ports, I believe the 96-98 intake/heads have oval intake ports and 99-02 has almost square and larger. You wont be able to use the fuel rails from the mustang. And from what iv heard, using the returnless system has no benifit. What you should get if you want a plastic intake is to get one from a 96/97 thunderbird/cougar. Using the mustang intake over a thunderbird intake shouldn't have any gain. I think a thundebird would work better because the port will match up.
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