Well, I found out hes got a K&N Air Filter or T&n as his brother says!

But, the thing has crash damage and he is repairing it so it will be a while. Thanks for the help guys! Also, how much do 3:73 gears cost? And, I know where Hinkly is, I've been there before, I only know a few Stangers that live around here and the pimped out there Mustangs!!!
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1998 Mustang GT with a 4.6 liter V8, Black