Hi Ray - Was that with your current CAT? Or a different coach/engine.
Our old exhaust manifold, and the new one, were two piece. 4 & 2 being the breakdown.
I told the DW, that if I had had any feel that this was going to happen soon, I would have researched in advanced for a 'header' type exhaust manifold. And I admit, I do not know of sure if diesels and gas engines respond the same to improve breathing from headers. But, my basic knowledge is that any engine that breathes better, performs better:)!
At what price, and for how much, is the question.
If a 'header type', improved exhaust manifold, can/could increase power output by 5 or maybe 10% - then I would have prepared better for this 'opportunity!'.
I have seen some 'Diesel Performance Improvement' Exhaust Manifolds - but have never researched them. My options were limited on this one, due to needing to get a healthy engine back on the road.
And I never lose site that Cummins engineered an impressive mid size block engine, to serve many customers. The RV'ing community was a relatively small percentage of the target market for the ISL (Or any Cummins engine.). Suspect the ISB is the exception, due to the high qty going into the Doge trucks, and a much smaller overall number of RV's.
It's a done deal now, as I doubt I'd toss away the new Exhaust Manifold now, unless I could guarantee at least a 10% increase in power for under $2K - and heck, while dreaming, toss in a 2-3 MPG improvement too:)!
Best to all,
Smitty
