The 89 TTA came with a larger one. Dont know if its stronger.
But..
I def would get a GM piece as it will be stronger. The Dorman stuff is chinese..
On subject.. on my TTA I used one I got from Summit it was a billet one.
Summit Racing SUM-G1465 - Summit Racing® Vacuum Check Valves - Overview - SummitRacing.com
I ran -6 hose to it using the AN style fitting. I blew my hose of my stocker at 28 PSI once and it was scary.. I went to this style never had anymore probs.
But..
I def would get a GM piece as it will be stronger. The Dorman stuff is chinese..
On subject.. on my TTA I used one I got from Summit it was a billet one.
Summit Racing SUM-G1465 - Summit Racing® Vacuum Check Valves - Overview - SummitRacing.com
I ran -6 hose to it using the AN style fitting. I blew my hose of my stocker at 28 PSI once and it was scary.. I went to this style never had anymore probs.