Just spoke with the people at Pypes for set of downpipes for 71 Olds Cutlass..They are telling me they only make them for a 442..If I want to buy downpipes from them I have to change my exhaust manifolds to a 442...Are they that different???.. that proves to be very costly in having to replace my manifolds.. Any one else have any good leads?? 350 eng...

 

I would just take it to a reputable, local muffler shop, and tell them what you are after. You may be surprised at the result.

 

Go to your local Muffler shop, talk to the owner face to face and get your problem solved. I doubt that Pypes can build anything better than a local shop.