I would deter you from going with Pacesetter long tubes, many people have had issues with them clearing the firewall, and nothing sucks worse than having to dent your band new headers so you can successfully install them. If you're actually looking for a long tube header look at Kooks or Dynatech.

 

Do the BBk CNC series LT1 header and Y-pipe make good power? I was looking into getting them

 

BBK is expensive for what you get. If you're looking for a better priced shorty header go for Edlebrock. That being said I will always recommend a good Long Tube over a shorty (unless you live in Cali in which case it's illegal). Theoretically all headers make the same "Power" as in HP, but a longer tube will get you more low end torque. A tuned long tube header is going to get the most torque/power that you can get out of an exhaust system.

 

If you just want a loud, great sound, I would go with a electric cutout. That would most likely be the best because if you see a cop, just close it and act like nothing happend. I have a Magnaflow exhaust I', not sure what kind because it already came with the car but I think it's this one:

http://cgi.ebay.com/ebaymotors/MAGNA...QQcmdZViewItem

It sounds really good but I need something a bit louder

Good luck,
Kris