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    Mach 1 89 octane gas make mach1 run better?

    I just purchased a 03 mach1 with a five speed two weeks ago when i traded in my 03 GT. I had been running 93 octane like the dealer told me to with a DOHC motor but it is so expensive so I tried 89 octane to try to save money and my car is running much stronger for some reason now. I just wonder...
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    Motorsport 70 mm throttle body= hp gain?

    I have a stock 03 Gt and was wondering if the ford motorsport 70 mm throttle body makes any performance improvement. Some people tell me it will, others say it is the last thing you should change on a 4.6. Thanks for any replies.