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What differences in performance will there be from the stock 3" to aftermarket 4". ??
 

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The 4" will decrease egt's help spool the turbo a little faster, and help your mileage and power, it will be minimal but still some.
 

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EGt decrease is what you'll notice the most, BTW 4in. straight sounds much better than 3in. straght pipes.
 

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The sound is so much better. It was very noticable that I gained low end power when I put the 4" exhaust on. I'm talkin 1000 to 1400 RPM low end.
 

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I used to have the stock 3" straight piped. I now have 4" DP to 5". It sounds alot better and the egt's don't climb quite so fast...
 
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