1st thing... long time reader, first post! I just put the Comptech springs and RSB on my 05 TL and I swear the ride got better! The TL rides a little stiff from the factory and I was worried that by dropping it with the lowering springs it might get a little worse. To my suprise, the car now feels MORE comfortable. The handling is much better, which was expected, but the transition over bumps and how the car handles road imperfections is noticebly smoother. Even my wife noticed it ( which is incredible in its own right!)
Thanks for keeping a great resource going Acurazine! You guys are great!

 

I installed my Comptech springs on stock shocks for a 1in drop alll around and the ride is way better than before....... I just got a alignment at the dealership..... glad I did cause my toe angle was out of spec..... I got -1.9 camber on Left rear and -1.7 on Right rear...... thats ok cause out of spec toe angle eats tires more..... The front camber is -.08 Left and -.07 Right.....

Your next step is to get an alignment to correct the toe so you wont eat tires.......

 

Perhaps the CT springs are progressive (softer in the initial travel then firm up as they compress) where the factory is linear (same rate throughout travel)?