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I like what you’ve done, subtle improvements without going overboard. Nice clean stockish look and should retain all the original reliability. For your next improvement you might consider a 3 bolt “big truck” exhaust manifold as found on C60’s. Does not come with that pesky heat riser and is set up for 2 1/2” pipe, so better sound and flow. I found a new one a few years back. Apparently they also used them on stationary engines and farm equipment, so was a call for replacements for quite a few years and there are still new ones out there.