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Can confirm that header used with the same exhaust system (stock or otherwise) as with the stock manifold the sound will have little change in loudness.
On the other hand the "quality" of the sound may change, due to the different ways of combining the exhaust pulses of the primary header runs, either 4 into one collector or 4 into 2 then into one collector.
Header without a free flowing cats and exhaust system, will not reap much benefit, due to the bottle neck in flow the stock exhaust causes.
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Speed: " It's really about judgement and intelligence; so long as your brain can go faster than your going at any time, you're all right, and it isn't fast." - L J K Setright
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