OhhWell wrote:
Yeah, ford doesn't include a set of tuned headers when the F53 leaves the factory. Does that mean that headers don't offer an improvement?
They do on the 1st gen 1999 V10 that the OP is asking about. Putting headers on the 99 also has the side benefit of "fixing" the exhaust manifold bolt issue.
Custom tunes have shown verified Dyno improvements in power (Usually not that much though) on just about every modern engine and the gains can be significant when the engine has been modified of course.
Anyhow, we have the full Banks system on our 99 F53 which is intake, K&N cone filter, headers, stinger and transcommand. The power improvements on such a system are usually only greatest at peak output but in the motorhomes, we are often asking near peak power from our engines. I'm not sure how much the air intake and cone filter help but they are there. I think the real boost is in the tuned headers.
I seem to remember they dyno'ed a 1999 Pace Arrow before and after adding the banks kit and the gains were something like 50hp and 70 lb-ft of torque.
I also put the full Banks package on our 1999 Pace Arrow Vision in 2001 or so. Headers,filter,transcommand,ottomind. Difffernce was notable. No more downshifting on interstate overpasses, better speed uphills. Ran is like that for another 80,000 miles or so before selling it. Had no issues.