I have owned two set because I sold my first set thinking that I was just going to keep it stock and sell my car after a little while. But I decided that I want to keep my tC, so since I plan on keeping my car a lot longer than originally planned, I wanted to go back! That's how I'm on my second set.

My personal opinion, I think they are very well designed spring adjustment kit. The ride is stiff, not bouncy at all with stiff springs. I would imagine that even with lower spring rates it would still be pretty solid, because the springs that GCs come with are LINEAR springs which stays the same spring rate regardless of compression, not progressive springs (most lowering springs are progressive) which basically doesn't hit the spring rate spec that its rated until its compressed so far. I was actually thinking that if you choose spring rates close to what TRDs rates and pair them with ur TRD shocks, it would be pretty solid considering you'll be riding on linear springs not progressive.

If you plan to go any stiffer than what TRD has set their shocks for , I would say you have to go with KONIs in order to adjust them to match the spring rate (this is why I suggest choosing the same spring rate as the TRD springs). Now if the TRD shocks are made by Bilstein... then you may be able to get away with it.

 

Well I could always get stiffer rates just so they would kill my TRDs a little faster then I'd have an excuse to purchase new yellows am I right? How easy are the adjustments?

 

The Konis are very easy to adjust, except the rears have to be completely removed and compressed all the way down in order to adjust the rebouhnd. The fronts are easy and can be adjusted from the top without having to be removed.

I really don't know how well the TRDs would do in terms of comfort with the GCs. I think it would be alright even with the 440 front/340 rear... or you could just switch the springs around to 340 front/440 rear.

However if you want to adjust the rebound for more comfort, just sell the TRDs and use that money to invest in some KONIs. I am very satisfied with the comfort that only the Konis will be able to provide with the GCs - with generally any spring rate setup probably up to 500 lb/in springs before they would need to be re-valved for an even higher spring rate. Plus they are lifetime warranty!

Another reason to sell your TRDs is I don't know whether the GC adjustable sleeve can even go over the top of the front shock/strut. I know with the stock shock, you have to pop off a gold metal cap on top of the shock/strut so you can place the GC adjustable sleeve all the way down. If you purchase the KONIs, you will have to cut your stock front strut housing and place the GC adjustable sleeve on before you slide the Koni insert into the stock strut housing otherwise the GC sleeve won't fit over the slight ridge at the top of the shock/strut housing.

All in all, great setup... a lot of work to have this setup with all the cutting and drilling of the front strut housing, but in the end, it's well worth it.

 

how do you'll think tokico blues and tein basics can fair with a ground kit. I been doing research just want opinions