i have this setup as well, its loud as hell, love the tone though..I did put the silencer in since it was a little to loud inside the car for me since it would be hard to talk to passengers or on the cell phone, the tone outside isnt as good, but still decent, with the silencer and almost just as loud outside..Also around town driving is much quieter then it was in cabin.

i have some videos with the silencer in that ill post tomorrow

 

ya mine sounds really good and the zzp downpipe has prolly made the biggest diffrenceout of all the other mods i have

 

the 1.5 helps, that's what i have, the 1.75 might help, or you might lose some
if you plan on boosting get the 1.75

 

yea i agree i think im gonna turbo my car sometime down the road