I have the DG setup on my FWD and they are very nice. I swapped out my Tein's for these and they ride much better. Ride is less harsh. I can't compare them exact because my DG setup has different (higher)spring rates up front than the Tein's had but my car handles much better with less understeer and better turn in. Rear springs are the same rate still.

i found jayracing is selling, are they good place to buy, or have to built myself

Koni yellows and Ground Control should be more than enough to suite your needs. The DG setup is more autocross/track enthusiast wanting to take their suspension to the next level.

I think it's over kill. You can save yourself a lot of cash and get something that will suite your needs just the same

I would think Jay's Racing is okay to buy from. Jay's Racing is the vendor which worked with this forum on the DG Koni Setup group buys sponsored by Snowboarder.

i think i will go to Koni and GC route. may be i can change the top hats later.