[mlue]

I was lucky depending how you look at it, my cat was bearly working so it was easy to troubleshoot. When I came into the pits after a hard run with lots of WOT around the track at Mosport there was no hint of the sulfer smell just raw exhaust like a "60 musle car. When I took it to the muffler shop they confirmed that the cat was not working. They said that when the cat is working the temprature of the exhaust coming out of the cat is alot cooler when compared to the temprature of the exhaust going into it. The Porsche cat is long, the front part houses the catalytic material and gets really hot and the back part does something but mostly acts as a resonator. It wasn't long after I arrived at the shop when they removed it, the guy was able to hold the cat in his hands. After replacing the cat there was lots of sulfer smell while driving, more than most cars so I knew it was running rich. I did an emmissions test after the cat replacement which it failed but there was improvement. I think I covered the rest in my previous posts.

Mark
"86 944NA