its really possible.i know it because my friend is from Spokane,Washington and he has a 1992 olds Trofeo Toronado.he has a 3.8 series one supercharged engine and he has 1994 buick reiviera exhaust manifolds and he did a true dual exhaust on his olds and it sounds savage.If i can get a sound clip,ill show you guys,but yes its possible to do a true dual on these cars.

We know it'* possible. And for the record, the exhaust manifolds you mention are designed for the engine you mention, so I'm not sure what you're trying to get at there.

The point we're making is that you'll lose low-end torque, and it'* not worth the time and expense.

what im trying to say its that the manifolds on the reiviera are bigger as in mesuring the with of the hole in the manifolds.He mesured them,plus,he told me he does not loose anything.(dyno tested)

It sounds like you're the only one that doesn't know you'll lose low-end torque. You can't fool mathematics.

The riviera manifolds are identical in runner diameter to every other Series 1 L67 here on this forum. And smaller than those that have ported them.

He couldn't have used them unmodified. He'd have to cut part of the rear to keep it from interfering with the crossover pipe, but the point is moot.

Every person here that has opened their exhaust too far has lost low-end torque. His dyno may have shown a gain in high-end horsepower, but I wouldn't give an ounce of torque up for 50 horsepower. No way in H E L L.

REGARDLESS......look at our top-25 list. NONE of them run dual for a reason. Myself included.

oh ok,if you say so,but im telling you that he did,but its all gravy if you dont belive me.and trust me,i know my math,and i know what im talking about.

There is zero point in arguing. The ones that have lost torque (gained horsepower) have the documentation to back it up. If you can't post the documentation, it might be wise to lay low until you can post it for us to see.

I'd almost bet much moolah that he gained horsepower, and lost torque. So far, it'* what happens 100% of the time according to documentation.

P.*. - The only way he can go to duals without losing anything, is if he went with narrower pipe from the manifold back. He'd have to drop from the 2.25" diameter (I believe that was stock) to less than 2" to maintain, or from 2.5" (if that was stock) to around 2". (Figure a ratio of about 1.3:1)

naw naw,but you know how the stock tubing is 2 1/2 in,well he increased it to 2 3/4 and has 80 series flows.

And like we said. We know these motors and the way they respond to exhaust modifications better than anyone out there.

He lost torque. He gained hp. Bad trade in any book. These motors were designed for torque.

Regardless, let'* get back on topic out of respect for the topic author.

Look at my edit above:

P.*. - The only way he can go to duals without losing anything, is if he went with narrower pipe from the manifold back. He'd have to drop from the 2.25" diameter (I believe that was stock) to less than 2" to maintain, or from 2.5" (if that was stock) to around 2". (Figure a ratio of about 1.3:1)

EDIT: Just saw Will'* post. No more on this, as it'* off-topic.