considering all of your mods in the sig are "SHOW" (with exception of KKM..)
I would go with the exhaust, to give it a little more "umpfh"... I mean.. larger rims have got to be heavier.. wouldn't you rather be able to actually MOVE them, than be lower and still "heavy"?
(NOTE: Obviously, this is not intended to offend anyone with 17/18 rims.. Also, this is not intended to belittle a cars ability to move such rims.. Merely speaking vaguely...)
It comes down to this: Do you want all show, and no go? or a mixture of both, or all go?
I vote for exhaust, next... not as big of a deal, quicker to do, and won't "set you back" as much, nor for as long, until you can do the springs..
Ray
