I talked with my dealer first. I was lucky and the head mechanic who races and knows a lot about Mustangs was drinking coffee at the desk. I did come prepared, because my stupid squad car, an Impala had been at the shop two weeks in a row so I was bugging them about warranty info...
Comes down to this. If you do any mods, they can be hard and say it violates the warranty, to include putting in a new radio. So you talk with the mechanics. My guy admitted, exhaust is not a problem. CAI not a problem. Matter of fact, the mechanic told me that if I am going to replace the exhaust and put on a CAI, then I should adjust for the torque increase and install an underdrive pulley. Tuner.....depends what you do with it.
They will be able to tell if you are racing or being a knucklehead. I bought the Steeda CAI / SCT3 tuner combo. Preset with 3 custom tunes based on octane level. I'm getting better economy with 93 octane with a performance "tune" than 87 stock. Better yet, I'm getting kick ass HP. Best yet, if there is a problem, I can retune to stock and visit the dealer...
Just establish rapport with your dealer. Simple mods aren't a problem, even simple custom tunes. The problem comes when you're modifying the engine itself or digging into the electrical system or putting in some stupid tune....
The Steeda / tuner kit is available at americanmuscle.com. Good luck. Its expensive, but takes care of two things at once. Better yet, the hp increase is very noticeable. At stock, you'll notice the lag when you want to punch the gas. With this combo, you'll actually feel the suction kick in and the speed jump. Good luck.
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