Could be anything. Belt(s) could be lose, the heatshield if you have an OEM header could be rattling very fast, etc. etc. What kind of squeak, like a squeal?
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Emily's personal boyslave
TSS: Rockin' the Bitches' Faces.
B16A2 engine with:
Short ram intake.
DC Sport header: Ceramic coated, 4-2-1.
Custom headerback exhaust with disconnected muffler.
MSD Ignition system. (With Enkei wires)
http://www.cardomain.com/id/imsoyesterday