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My work entrance has a steep incline that is all gouged up from cars scraping. My BRZ can tackle it straight on no problem. My '03 WRX wagon with a softer stock suspension (and a bolt on rally innovations bar) will scrape if I go too fast head on (ie 6mph instead of 3).
If you can angle, you should be fine in most cases. I angle over speed bumps - not bc it doesn't clear, but bc when both wheels on the same axle drop at the same time, there's more suspension compression and it can "thunk" if you go too fast (ie 3mph vs 1!).
OP - are you looking to ride 1" taller all the time, or just negotiating one entrance? Solution could be as mentioned to put ramps over that extrance, or a more complex solution might be some sort of air bag suspension that would allow you to raise and lower your car on command. (Not sure if they make it for our cars or how they affect handling.)
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