is thier any gains fom swaping my 15g for a 16t .Iam thinking of going ahead and getting a full 3" turbo back and maybe swapping the turbo at the same time.

 

You will get some but not all that much.
If you have more plans in the future maybe just go up to a 19T and be done with it.

 

Well I don't plan on going to crazy with this car but I if I can get a littel more on the top end that will be nice. Right now the car pull hard in the mid range then it holds back (runs out of steem).I am sure a 3" turbo back won't hurt

 

Also the 15G turbo's are well know to have boost fade. Meaning when you are at full boost still picking up speed the boost pressure drops.

Going to the 16T will do away with that alone.

I see the boost fade on mine as well. The exhaust gave me a little more power and the Turbo spools faster as well but the fade is still there.

 

that explains it i have my boost set to 15-16 psi but then it drop down to about 13-14.so by going 16t i will have the same pull all the way up to red line?. that will make me very happy. I just whant to have a fun daily driver.I got other ways to cure my speed needs.