Fastest/most power 2 1/2" DP??

[Superskwrl]

What is the fastest (mph)you have gone with a 2 1/2" Down pipe and whats the most power you have made/heard of / think is possible?

keep in mind if its open exhaust mention it, and the length of tubing before its open

Thanks

 

[turbo buicks]

iirc, redsbdassel went low 12s in street trim on radials in a low 11s car thru a hooker 2.5" DP