Is there a program or website out there that can tell you how many seconds you lose in the 1/4 or 0-60 category whenever you add weight to your car. For example if you add a system and have the sub in your trunk, or adding bigger aftermarket wheels, stuff like that.

Yes, but nothing for wheel weight but diameter is there.

Heres the link http://www.virtualengine2000.com/ProgramDownload.htm

I also have a basic program (zip file) that translates e.t.'* into hp. If interested pm me with your e-mail address and send it on over.

Thanks guys!

taking a guess > all that fancy stuff