Seriously, if you're gonna go down the dual exhaust road, then do it right. Since it's pretty difficult locating GT takeoffs in good shape anymore, just find the sound you want from your system (Flowmasters or Magnaflows are very popular), then have a shop fab up the rest of the sytem for you. The only thing you may need to buy extra is the hanger kit for the passenger side piping (if the shop can't do this for you). If you don't plan on adding a lot of power mods like forced induction, then stay with a 2.25 diameter system. Most people experience significant torque loss at the low end by going with too large a system for a relatively stock engine. If you plan on going with power adders that will take your car over 300hp, then go with 2.5 diameter piping. Being an even firing engine, an h-pipe isn't needed, but many will tell you that it mellows or deepens the exhaust tone. Go with a true dual setup (not a y-pipe hook up system)... you'll be much happier knowing you have "true duals". And don't forget to find some nice tips for the 'bling' effect you want in the back.