Throttle body diameter?

[jt5]

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.

[Igovert500]

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.

[Stealthee]

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

[jt5]

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.

[Igovert500]

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. It's a pretty common occurance.

[Stealthee]

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.