reinstalling the original muffler - do I need the cat on an '87?
 

hey guys do you need the cat with the original muffler or a bypass is preferred? Pros and Cons ? Car is exempt from state inspections/emissions.
Anyone recognizes what aftermarket exhaust is currently on this '87 930?


http://forums.pelicanparts.com/uploa...1766442121.pnghttp://forums.pelicanparts.com/uploa...1766442463.jpg

If you're running the original muffler then you have two choices: install the cat, or install the bypass pipe, if for anything but to bridge the gap. Since emissions are not an issue, what I did years ago was to drop the cat and install the bypass "test" pipe in its place before upgrading to a B&B muffler.
After market exhaust like yours, they will not accommodate a cat or pipe, as shown in your picture....no room. We don't need no stinkin cats!
Your muffler is either a B&B or Borla.

Who even needs that stinkin' muffler!

http://forums.pelicanparts.com/uploa...1766489168.jpg

thanks, what's the best bypass pipe for the stock muffler?

I lean towards the Fabspeed one.http://forums.pelicanparts.com/uploa...1766522919.jpg


https://autotalent.com/products/fabspeed-cat-bypass-pipe-for-porsche-911-turbo-930-1976-1989

thank you