Dear Mr. Winter;
No; They use the manifold I sugusted.
It's similar to the 250, but a little larger and has a 3 bolt flange that uses a 2" header pipe, which is larger than the stock 250 pasenger car's 1 1/2" one.
There designed for 'commercial' use on large trucks and remove the extra heat, when hauling heavy loads etc.
Headers into a single pipe is just a waste of time, effort and money for stock/street (low RPM) engine/usage. Plus all of the extra/unecessary 'plumbing' involved with it.
Happy trails.
