What do you of lowering this model? may 1 or 1.5 iches.
Will Borla exhausts add to the top line in a measurable way?

 

i went with h and r sport springs, 1.75 front 1.5 rear.

what do u mean by adding top-line, you mean performance? changing exhausts wont give u much gains, 3-5 hp at most. they're just for sound and looks

 

I'd go with Comptech springs for a 1.5" drop in the front and a 1" drop in the rear. Looks real nice.

As far as adding power to the top end of the car, headers are the way to go there.

Both can be bought here:

CCC

 

I know on my Civic my full catback probably added about 2 hp. I figured on a bigger engine like the CL-S has it would add more than 3-5. But that's just me talking, I'm a rookie to the CL's.

 

^---yes, however, the exhaust on the cl-s is already very free-flowing. Hence, the minimal gains in exhaust.