sbrandon

sorry if this question has been answered before. I have had this 1987 IROC since the late 1990's. Last year I had the cat (s) removed and a new exhaust was put on. The shop put on a flowmaster 40. I had no idea how loud those were and the car was not running correct at 1200 rpms. I thought perhaps it had something to do with back pressure. So, to test that theory and quite the car back down, I had a new cat installed. But I got to thinking, did this car come with 2 cats from the factory? The shop only put one on. From what I read, it was a later option, but not available in 1987. I thank you for your info.

And by the by, the car runs much better now at 1200 rpms with the cat on.

chazman

iTrader: (4)

N10 dual cats weren't available until 1989.

sbrandon

Thanks for the verification. I thought I might have done something stupid. Now I am wondering if I should have, or if it would have been difficult, to have the shop put two of them in.

chazman

iTrader: (4)

You'd need a different Y-pipe.