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It depends on a few things,some headers fit better than others and if your car is lowered or not.
My 2001 is lowered but I have high end stainless steel long tubes from American Racing which fit really well.
It will scrape a tad on speed bumps but not real bad given how low my car is.
My suspension from the K-member on back is all tubular and I have Strano springs and sway bars with Koni shocks,also sub-frame connectors so she's pretty stiff.
I just take it real slow over speed bumps and it's not really a problem.