Sounds like this is another Boxster you have now, not the one you put the M030 kit on? I also put the Suncoast ROW M030 kit on own 2003 S 5 or 6 years orlonger ago, it was on sale for $1,900 or $2,000 then. Maybe the Koni Sports STL-986 recommends, with some H&R lowering springs and a thicker front sway bar would do the same for less money. I can tell you that the part number on the rear sway bar in the ROW M030 kit from Suncoast was the exact same part number as the rear sway bar that was on my car from the factory, so you shouldn't replace that if you are buying separate parts.
And if it's helpful, I made this ROW M030 parts list at the time I bought my kit. 
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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