Throttle body diameter?

Does anyone know the throttle body daiameter for a 91 RT/TT?
I bought one of theose aftermarket Y-pipes and it came with a straight 3" coupler. That didnt work so well, so I'm going to buy a reducer coupler and didn't want to take the Y-pipe completely off again to measure the throttle body.

Thanks for any help.

I think it's 60mm but I'm not 100% positive, so hopefully somebody can confirm that.

So where did you get your y-pipe, I'm hoping not ebay. Does the lip have a bead on it? Otherwise it will probably blow off alot under boost.

It is a 60mm opening. The outside edge is something like 2.5".

Thanks for the replies. Yes, it was off Ebay and it does have a lip. Seems odd that it does because it only needs it to conform to the stock gasket and there's NO way this pipe will fit with the stock gasket in place.

it needs it, because without it, once you start boosting, it will pop right off, you will hear a bang as it hits the bottom of your hood, and your car will die. :grinyes: It's a pretty common occurance.

Haha I did something like that once. My stock intake started falling apart at the joint. I thought I had it fixed, went to the track, launched kept the gas pedal buried as I did a 1-2 shift and BAM, cars struggling. I chugged down the track to a whoping 44 seconds at 22 mph.