I currently have a T1R 63mm Sparrow running on my SCed S @ 9psi. I would like to put my stock exhaust on to see how it would sound like, i much prefer the look of the stock exhaust as well. Is a re-tune in order? Thanks!!!

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63mm Straight Pipe

 

doubtful. but its always good to check it on the dyno if available

 

i would wait until u change something more drastic b4 retuning

 

what if you went the opposite direction.....say 70mm header back to open header? Retune needed then?

 

without a tune, running open header won't gain much hp and you'll probably lose a good amount of torque. I know my car felt real slow when I took off my exhaust for fun.