Koni Orange -- So it was asked and I don't think it's the easiest to answer, and probably not an easy read, so I will attempt to provide a perspective on the very basics... first let's look at the stock setup and then how we change for higher spring rates.... stock struts/shocks have too much compression damping (especially high speed compression, too slow) and not enough rebound damping (too fast) for the stock springs (especially shocks lack the rebound). With the stock springs, Koni Orange will improve (speed up) compression damping providing better comfort even and also control, and the rebound is also a little slower. They are decent for use along with the stock springs, and an improvement. The rebound damping is the same as Koni Yellow set to the fastest setting per Koni BTW.
If we increase spring rates from 172f/137r to 222f/165r with the Whiteline springs, the stiffer rates work WITH the compression and AGAINST the rebound. So compared to stock springs, the rebound needs to be slowed down to control the higher spring rates, and it's preferable that the compression is softened (high speed compression for sharp impacts and low speed for brake dive and cornering, as the springs are working the same direction as the compression damping circuit).
For the Witelines, the Koni Orange is a good step better than the stock again in both aspects, but still lacks the rebound needed for controlling the higher than stock rates... the Koni Yellows would be able to match the higher rate springs better as they are similar to the Orange in the fastest rebound setting, and we can adjust the rebound to slow and better control the higher rate spring. Looking further at the Whiteline springs, they have a soft rate area right at the beginning of travel, and Koni Orange will work better than stock especially driving on the streets on the softer part of the coil, but more aggressive driving the Whiteline springs will overpower the Orange rebound so it will be more bouncy and less grip/control. I think the Yellow is a better solution due to that, especially with the rear, it needs to be cranked down at least to where there's only an 1/8 turn left .
Another opinion... but I haven't tested this myself... The Bilsteins seem to use a position sensitive rebound damping system for stock height or lower height springs, and the Bilsteins which are designed for STOCK height springs actually may match up to the Whiteline springs performance wise as a less expensive solution to the Koni Yellows. For going with softer lowering springs (Mountune and especially the very soft Eibach), the lower height Bilsteins may match up a little better. I think the Swift springs need Koni Yellow shocks as a minimum, or something more advanced and adjustable.
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