when it comes to suspension there is no such thing as best, its all personal preference and opinion. imo i wouldnt even lower on stock shocks
2006 Lexus GS 300 AWD – Glacier Frost Mica - Black - ML Package
20" x 8.5" Status Knight Wheels Black with Machine Face | Bridgestone G-Force Tires 245/30/20 | BC Racing Coilovers | Carson Tuned Lip Kit | 3000k HID Fogs | Prestigious Society Navi/DVD Override Kit | 15% Tint | Black Roof and Window Trim
Ive had a few diff ones and I like the Tein S Techs, and they provide a great drop.
14 IS 350 F-Sport Ultra White/Rojo Red - Vossen VFS1 - Debadged, Gloss Black Roof, Gloss Black Spoiler, V1/Blendmount, Joe Z Full Exhaust, Joe Z Intake, RSR Coils, Skipper Front/Sides,Seibon CF Diffuser,TRD Start Button, JL 10W7 Sub, JL 500/1 Amp
I can't vouch for Eibach, Road Magnets, etc. since I have the Tein s techs currently. I will say, they provide a very comfortable ride, are reasonably priced, great handling compared to stock, and definitely filled in the ridiculous gaps in the fenders well. Definitely recommended by me.
2006 IS250 AWD - Tein / Joe Z / Steering damper (current ride) ~ more goodies to come
2000 GS400 (SRT, Bilstein, Espelir, 25mm spacers, Polyurethane bushings, etc.) ~ SOLD
1999 Mazda Protege ES (K&N, Eibach, Tokico, Alpine, Zapco amp) ~ Retired
+1 on H&Rs IMO the best springs besides tein. gives you a good drop to minimize wheel gap and not slammed bouncing around with road magnets. also consider just getting coilovers, im regretting it now lol.
I have Road Magnets on my 2010 IS250, the ride is pretty decent, but compared the Teins i had on my Acura TSX & TL i think they were more comfortable. But my Road Magnets provide a sick drop. Definately the lowest springs out there for the 2G IS.