Question: True Dual Exhaust

[berry1133@bellsouth.net]

Hello. My exhaust has been modified so that I have 2 pipes all the way back (2 catalytic converters). The problem is that instead of have 1 catalytic converter under the crossmember, I have 2. It's not a perfect fit so one is a little lower than the other. I want to find a dual exhaust crossmember so that I can run both pipes straight back (no bends). Has anyone done this and if so, what dual exhaust crossmember will fit?

Thanks,
BBerry

 

[6880 Mike]

All stock X-members 68-75 have provision for true dual exhaust. Standard trans X-members are welded in. AT X-members bolt in.

 

[berry1133@bellsouth.net]

Thanks. Will the 68-75 Xmember fit the 81?

 

[Peer81]

If you have a standard 350C transmission then Yes.
You can also look at the transmission sellers the also sell aftermarket crossmembers that give you alot of space.

Greetings Peter

 

[jj_long81]

doc rebuild sells em.

 

[Peer81]

You could also take out your current crossmember and transfor it in a true dual excepting crossmember
I did the same with the 82 crossmember I have right now.

Greetings Peter

 

[berry1133@bellsouth.net]

I did get a crossmember off a 74 Vette. I ended up not using it because I would have had to add a bracket for the transmission mount. Instead, I just ran two separate pipes all the way back from the headers to the mufflers.

What really shock me was that when I cut the cats off, they were (p.o. had put two separate ones on) all broken up inside. Therefore, I was not getting nearly the exhaust output that I should have been getting. No cats with magnaflo's.

I took her out on the highway and got it up to 103 with no problem. Still had room to go. I fell in love all over again. I was being robbed of a lot of horsepower.

BBerry

 

[berry1133@bellsouth.net]

Now that my car is breathing a whole lot better, I've noticed that the exhaust sucks in a little bit. When I place a dollar bill at the tip of the tailpipe, I notice that it gets pull in for a slit second. One of the previous owners replace the heads, intake, valve covers and rockers. The aluminum heads are Edelbrock along with the intake and valve covers. I believe the car has also been outfitted with a mild cam because of the way it idles while in gear. Could this be the reason for the exhaust behaving the way it does? If not, is there something I should be checking for?
Thanks,
BBerry