How much are those skid plates? Mine got oil soaked by the P/S pump leaking. Now there's no leaks but its still oil soaked. Plus, the wholes enlarged and the bolts don't keep it in place as well.
I took mine off of the old S13 since that car was a leaker and it got trashed. I had no ill effects by doing so. I like to keep mine on the car now. Granted, its a pain doing oil changes since you gotta remove it to prevent oil from getting everywhere from the filter (unless you're like my friend who never does any maintenance).
The heat shield removal? Why, its there to keep underhood temps down. Its there for a reason. Do you really want resorvoirs melting like my buddies turbo'd S14 with no heat shields? I'm sure it helps with HO2S and cat warm-up.
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