[Eagalicious]

I am following the Buschur upgrade sequence and am a little confused. I hope you guys can help me out. Step 2 is this:

2. Cat-back Exhaust System
AWD with 12 or 13 sec goal:

Buschur Racing 2.5" Pressbent Aluminized piping with Stainless Muffler and 4" Polished Tip - 1G or 2G (AWD Only)

All Turbo FWD or AWD with sub-12 sec goal:

Buschur Racing 3" Mandrel Bent Stainless piping and Muffler with 4" Polished Tip - All Turbo FWD and AWD Models

Now I have read a few posts and people say that it is best to do a turbo back. If i understand correctly, that is a down pipe all the way back. I also read there is a 2.5 and 3*. My question is this: Will I have to make any modifications to fit a 2.5 or 3" down pipe to my turbo or does the down pipe fit connect fine from the flange then goes to 2.5 or 3' from there?
I also read that if I use a 3" that I could get boost creep I have to look boost creep up again but it doesn't sound good. What would be the best muffler to use? I have listened to HKS systems and they sound nice. I don't want the loud sound I hear the kids using around here. I also wanna keep my dual tips if that is possible.
Buschur says do the down pipe at stage 2 of the upgrade.

Any advice would be appreciated guys. I was told I would feel an increase in power a little bit. Hey... I have to start somewhere

Thanks in advance guys