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With some good Headers you might make 5hp more. I get mine Coated cause it cuts down on heat on engine. Paid about $200 for coatings. But I would not mess with either unless you're racing. You get about the same power boost by removing the powersteering belt/AC.
It's kinda of a PITA cause the nuts are always rusted and difficult to reached without several types of 13mm universal wrenches. Then sliping the Header on/off a head in the engine takes a little monkey grease to get around the engine compartment. Doubt you could hurt anything. WD40 the bolts the day before to lossen up. You'll also have to drop the exhuast from the mounts under the car which is also a bit of work, before you can start on header. Ie front end must be well jacked to reached.
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1987 924S with 968 Drive front to back, Bilstein Insert on mod/stock Struts, 450# Hypercoils, 28mm Torsion Bars, Weltmeister Adjustable Sway Bars, Lindsey 968 Light flywheel, Spec Stage II Clutch, ToYO RA1's, Auto Power Cage & 6 pt Harness, KLA Strut Brace, Greasy hands, heavy foot, and lots of smiles
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