Originally posted by Dan Nixon:






Are you able to reduce the size of and taper the (empty) precat chamber to make it more "collecter" size/shape?

I have one of the old (if not only) Roush protype (belong to Dan Beggs) front manifolds (the precat is replaced by a collecter and the L shape elbow is a smooth mandrel bend and an interested in making the rear manifold precat chamber match..







To address your comment... Although I considered chopping off the "expansion chamber" and welding in a straight through pipe (c/w mandrel bend on the front precat), I took the easy way out and did not. Internal welding was done at the flange to shell connection. I do not recall which, but 1 is welded internally and the other externally. Both are welded internally & externally now. Then I used a die grinder c/w carbide burr set to properly 'flow' them as there are plenty of jagged bits of metal sticking out into the airflow.

However, they have to be removed and reinstalled on my 96 so maybe more work is in order....

My guess would be that the Roush piece you have is a custom 1 off and if you can find someone who can custom fabricate a collector for you, preferably from stainless you'll be all set. Finding 4 or 2 into 1 collectors is easy, but 3 into 1....?

Redcoat Raceworks. Performance parts and custom fabricating for Contours, Mystiques and Cougars. Specializing in chassis and suspension parts. Custom end links, control arms, strut tower bars, engine torque braces, etc.