I was looking into getting a turbo shortly. Question is, I originally was going to go with a blower, so I got my greddy se exhaust, berk 70mm testpipe, and berk header. I'm wondering how much would running the 70mm all the way back from the downpipe matter on a 3076r setup. I'm only going to be running 12-14psi for the time being. I would really like to just keep the greddy for now as I like the way it looks, sounds, etc. I guess the main thing is I don't feel like having to take off the one I have now, sell it, and get a 3". Any opinions?

 

Probably won't make that huge of a difference at that power level. Unless you are really concerned with making the most power possible, then you're probably fine with the greddy for now.

Its all about what you're looking for though...

 

Im at 14.5psi and I run a 3inch dual with no mufflers. I wanted a nice free flowing exhaust. It is quite loud like a corvette with a borla exhaust but I love it! What are your power goals?

 

4" or bust

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I would like to hit 400 for now.

 

Im 454whp and the exhaust works great with my setup. The 3 inch I run i custom fabbed with the stock OEM tips of the AP2. It gives you the sleeper look but does not sounds stock at all! IMO I say go 3 inch.

 

You will be fine running the 70mm greddy if your goal is 400. If you are wanting more than upgrade but worry about that when the time comes.
What size is your downpipe?

 

I made 640whp 472tq. 21psi on a 70mm exhaust.. sure I can maybe free up a couple horsepower but I save with weight and the sound is nice. (Titanium)

 

I made 565whp with a 3" or 76mm exhaust