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do you know the offsets of your current wheels? they will be stamped on your wheels. or, if oem, what wheels are they? what tire widths/sidewalls are you running?ride height? if we know that them we could advise the max spacer width that would work for you.
otherwise, offset is the distance the mounting face of the wheel is offset (+ or -, often called 'et'; ie an offset of 65ET) from the centre line of the wheel. OEM boxster wheel will have an offset of about -50 mm front and -50 mm rear. often the '-' is left out. a larger offset wheel (ie, a 996 narrow body wheel has rears in the -65 mm offset range) will move the wheel further inboard and risk contact with struts, parking brake cables, trailing arms, etc. a smaller offset (ie, a 964 wheel at -35 mm or so) risks contact with the fender. spacers can move a wheel out if it is too far in, but can't bring a wheel in that is too far out. the math is easy; wheel offset + spacer width = new offset. so, a 20 mm spacer on a 996 narrow body rear wheel at 65ET is -65 + 20 = -45. limits for a boxster is max -40 front and -40 rear. of course, tire width and height, aggressive camber, and ride height are all variables that can affect fit. if you are on oem wheels then you are looking for spacers in the 7 to 15 mm range.
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