Opinion on replacing Cat or Cats on Firebird
89 Firebird Formula 5.7 350 TPI. The cats have worn out on the vehicle and I have a small exhaust leak on one of the pipes. I am debating whether to use a Flowtech Y pipe and only use on high flow cat or to stay with the original configuration, using two cats. Does any one know if I will get more performance using one cat or keep the orginal configuration. I still want to keep the vehicle street legal.
You will definatley get more power from using a single high flow cat than
two restrictive stock cats.
Plenty to choose from. Most are $79.
I thought you'd get more power from duals then you would from single exhaust (maybe just get 2 bigger/less restrictive cats?).
That's not what I was thinking... The most ideal situation is (Still using cats) is have TRUE duals all the way from the headers back, using 2 high flow cats and two mufflers (keeping it legal). I was just suggesting doing a Y-pipe from the header's end to a single cat (something big like 3" in/out), then you could put it back out to duals or go single, wouldnt make a difference really at that point.
Thanks for the info, I was thinking the same thing. The stock configuration really seems funky. You have two pipes and two cats then a Y after the cats to single pipe to one muffler with dual exhaust. Pipe is 2.5. I am not sure I can put a 3" Y back to exhaust manifold. I really don't want to put headers on at this time because that would mean reconfiguring the smog pump. Thanks for the website I will check it out.
Oh I'm sorry, I thought TRUE duals were being used, in that case then your idea would be better.