rock0530

hi,
im looking to do an exhaust system on a 75 cutlass s 350 motor it has the stock cat and single exhaust which i will be cutting out but i dont know if i should do dual exhaust or single and i also want something that sounds good and not way too loud any suggestions.
Rock

hookem horns

A good local muffler shop should be able to bend up and install duals connected to factory manifolds for a fair price. Take your pick of turbo-style mufflers but Flowmasters tend to be loudest.

Fun71

Yes, you should do duals.

oldcutlass

Duals can be done by a local muffler shop easily. Check with some local hot rodders and at car shows for a referral.

redoldsman

Keep in mind that 1975 was the first year of the catalytic converter. I have seen some muffler shops that would put duals on without it if you drove it in without a converter. By now, the old cat would be dead. You may want to check what is required in your area.

seansolds

I have 17 inch extensions off of headers 17 inch flowmasters and 24 inch pipes maybe to loud for some but turn up the volume..

copper128

If converting to duals, make sure you have a double-hump transmission crossmember. If not, you'll need to find one from a '73 or '74 A-body or you can modify your original. There are probably aftermarket ones you can buy, too.

rock0530

thanks everyone i wil be sure to take some pics and upload ones i have already soon

opos

Just waiting for "delivery" on my "new to me" 73 Cutlass Supreme...here is a pic of the dual set up on it...The Flow Masters "have a solid rumble" outside the car but not noticible inside..."according to the former owner"..Thought these pics might be of interest..

opos

Lars

summit sells a dual kit $219 tyd, i can tell you what it sounds like in about a month when i get mine done

jag1886

Since we have no idea where you live, you should check around and see what you can do. I know a lot of places and a lot of shops won't allow or change a single cat exhaust to anything else, which means you may have to use one of those dual exhaust kits and built it yourself.

jerseyjoe

Yes, 73 or 74 cross member should work. I converted my 77 to dual exhaust. The holes are already there for the cross member as well as the holes for the left side muffler and tail pipe hanger. Any exhaust that fits on a 74 should fit your 75. I bought dual front pipes, mufflers and tailpipes for a 74 cutlass 350 and they fit fine. You will need the cross over pipe block off cap for the passenger side exhaust as they do not make a factory manifold for strictly dual exhaust for the small block olds. I can probably find the factory part number if you need to reference it. But I believe most olds parts places have aftermarket one.