2004 MCS JCW with 142k and redoing suspension...I see many posts about shocks and springs but, I want some new info.
I think I'm set on Koni Yellow (unless someone can sway me to Bilsteins (B12 Pro Kit - I think?). With that being said which springs should be paired with them?
Swift Sport Springs, R-Spec or TSW and WHY?
I do drive the canyons, I drive PCH everyday for work and I would describe myself as a 'Spirited' driver. Also what adjustable rear lower control arms are best (for price and quality).
I will now let the info flow in..TIA.

 

I have experience with both springs you are considering, combined with the Koni yellows, as well as FSDs and JCW springs on my R53.

With the Swift R-Speed springs on the street, I had to pick a good line around potholes or adjust my speed through minor road construction. An unmarked speedbump at night (even at slow residential street speeds) can result in suspension bottoming hard in front.
However, get it on the track, or in some good smooth twisties... and it's well worth it. The question is… where do you spend the most time, and what are your aspirations? The Swift springs are significantly stiffer than stock (double), but they are shorter, reducing jounce suspension travel by half. I would call the ride quality for daily driving "a bit harsh". My wife described it as "brutal" for the year they were on my Mini.

The TSW springs with the Koni's are a better choice for a "spirited daily driver", and a big improvement over stock on the twisties. Both TSW and Swift springs are fixed-rate, and that's a good thing. (The Swifts might look like a variable spring, but the close coils are virtually touching once on the car, so they become spring-spacers with the two spaced-apart coils doing the real work, but they keep the springs from dropping out of their mounts when fully extended.)

I also replaced the stock bump stops with FatCat (now 5X Racing) stops, trimmed 6mm in front. The combination of the TSW springs, Konis, and FatCat with IE fixed camber plates is a good mix for both street and canyon-running, and an occasional track day. For adjustable lower camber links in the rear do pick a name-brand with zerk fittings on the ends so they can be re-greased occasionally. Some of the no-name links have had failures. (I am using H-sport/Hotchkiss.)

Just my 2¢. . . your mileage may vary

 

Great info! Based on that, it looks like is TSW springs. I would consider myself a 'Spirited Daily Driver' and definitely hit the canyons. Do you have a pic of how your car sits? I would like a little lower than now but definitely not slammed. The last car I had that was lowered was Ilse my 2003 Passat. It had Koni's with H&R Springs.

Ilse @ Treffen Chicago...Won 1st Place!

 

Still curious if ANYONE has tried the B12 Pro Kit from Bilstein?