First, too many topics and post to go through to see if its been discussed. Sorry.

I have only been able to find Thermal and Tsudo in the 3" size. well i guess its 70mm right? Other than these two, can anybody suggest anything else besides custom piping from an exhaust shop?

Also, would there really be any difference between a custom exhaust and a premade exhaust as far as performance goes?? Thanks everyone.

 

3" is 76.2. Thermal is the only one I know of that is pre made. There is no power difference if they are made correctly

 

if I put a 3 inch from the headers back and leave my 2000GSR NA for now will I loose and performance?

 

You will lose a lot of back pressure to give that down low torque in N/A cars. But if you are doing FI anytime soon, go ahead and go with 3" to save your time and money. Turbos love flow