Full disclosure, I'm coming fresh off a lowered X3 M40i making 600HP, which I always drove in Sport+ Mode - So, it was stiff, tight, and ultra-fast ( 0-60 2.9/sec ). I drove that for 4+ years and loved every minute of it... but for a variety of reasons, it was time for a change.
I only just bought this GV70 2-3 months ago, so I've done all these
mods in short order, obviously... meaning, I didn't get lots of drive time on the factory suspension. That said, I didn't notice any kind of substantial change in the smoothness of the ride, although I do feel that it is definitely taking the corners much better now, due to the extra rubber. In terms of the overall ride, it's still as smooth as butter, which is quite an odd feeling for me, compared to my X3 M40i. I wish the GV70 had the ability to electronically tighten up the suspension a bit more in Sport+ mode, especially at the $70k price point, but after all - this is a Genesis, not a BMW lol.
With regard to Lowering Spring options - At the time of this post, I'm only aware of M&S and Storm manufacturing compatible springs. I originally ordered the M&S springs. However, after waiting 4 weeks with no shipping notice, I decided to inquire about the Storm Springs. My contact at Shark Racing confirmed that he could have a set of Storm springs Delivered in 3-4 days - So I promptly canceled my M&S order and bought the Storm springs. Now, from what I've read elsewhere online - The M&S springs will take the GV70 down even lower than the Storm springs, by 3/4 inch or so. Honestly, while I think mine looks nice - I would like it to be a touch lower, but I just don't have the patience to wait months on end for products to ship. I don't know if M&S is still taking forever to ship these, you'll have to check. I do want to say that my purchase experience and level of communication with Shark Racing were phenomenal, so I highly recommend.
Spacers - Since Having Installed the Wider HRE Wheels + Wider Tires, All (4) Spacers Have Been Permanently Removed.
Oddly enough, I have noticed that it has a more cushiony feel going over the large speed bumps in my community, again the opposite of my BMW - I wouldn't have expected this, but perhaps this is again due to the wider
wheel base and extra rubber. Whatever it is, I definitely noticed it, and it feels a lot better.
While I'm loving this GV70 experience - My main complaint is the transmission tune in Sport+ Mode. It's way off, specifically getting from 2nd to 3rd gear at full throttle, so I'd love to get into the software and tweak that, but for now - I'll just be using the paddle shifters. Again, I have to keep reminding myself that this is not a BMW, so I need to set my expectations accordingly, lol.
I should also mention that I did purchase the JB4 Tuning Kit which is supposed to bring an additional 100HP to the wheels. We'll see about that, as I have yet to install it. So many things to do, so little time...
Additional photos coming
very soon, Stay Tuned...
mega bummer for me as I wanted that controller to soften up the ride as the stock 21’s ride a bit rough!
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, zonk... This is why I couldn't get those spacers off fast enough and buy the new HREs which resolves every issue relating to the look/feel/performance of the wheels/tires. 
