Where did you find the KW Variant 1 for only $1,350? And since you said you're going for ultimate performance, the Variant 1 is not it. They're better than stock, but you need to go up to a Variant 3 to get to their real performance stuff. KW makes very good quality stuff so they're a good name to go with. They're getting a bigger and bigger following in the Porsche world too, though for real performance the Variant 3 is once again the way to go.
The Whiteline 24/22 front/rear setup (adjustable not fixed) is also a great way to go for sways.
The OEM tires as others have said aren't all that great, though I wouldn't call them terrible either. Personally I'd run with those until they wear out before upgrading unless you have $1000 burning a hole in your pocket to get a new set of tires. You could also advertise them for sale locally and maybe find somebody to take them off your hands for $500 and put that towards new tires so you could get some sooner.
Since you're focused on performance, you really should upgrade your brake pads too. You really only need the front pads to start to get a serious upgrade. Some Ferodos, Hawks, or other street/track combo pads would definitely be a great upgrade to match with your new suspension.
Scott
Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
'13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
'04 Porsche 911 Turbo GT2 clone 600 HP/TQ
'77 F-150 heavily modded for off-roading
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