Precision GT-61 turbo?

[Dabigguy]

I bought a car and the previous owner says it has a "Precision Turbo & Engine GT-61" and I am trying to order a TT chip before the Black Friday sale ends and I cannot find any info on this turbo, any tips?

Here's a link to the car from a few years back, maybe someone knows the car?
http://www.turbobuick.com/forums/cars-sale/169389-1987-gn-t-top-car-southern-maryland-8300-a.html

 

[Eric Stage I]

Just put "61mm" for the turbo and that should be close enough.

 

[Dabigguy]

Thanks !!!! I'd rather give too much info than too little (darn engineering background)!!! I really appreciate the feedback !!