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I have a single turbo kit and need help deciding what to to on the exhaust size going up to the turbo. My concern is it comes out as dual 2.5" and Ys off to a single 2.5" up to the turbo. I've heard it will be fine and others say go up to 3"??

2007 GT500
Single Precision 78GTS turbo kit
A/R is .81 and going to .96
Down pipe is 3" and going 3.5" but hopefully I can fit 4"
Sheet metal upper intake
Built motor/ported heads w/turbo cams

Here are some pics:








Thanks for your help!!
 
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