The think is there is no one runner length that suit the engine and a fixed length can and often is tuned for more than one rpm band as short runner for eg might be tuned at 3500 and 5000, being 3500 might be the 5rd harmonic and the 5000 being the 3rd.
On some of the simulated v6s I have designed in software the runners have to be longer than stock as it happen the 3rd harmonic was a possible practical length at 7000 rpm where a stock engine at 4500 for eg sits on 4th. Of course if I use the 4th the 7000 rpm engine will need shorter than stock but that's not possible without a custom intake and 3rd have a stronger amplitude than 4th so better performance.
Im sure if you could have an LS style bananas on a holden V8 with big ass TB it would go really good.
Check out hogans manifolds. There make custom sheet metal intakes and are known to be the best. They even have listed an LS banana manifold entirely made from sheet.
like this. Checked their prices, cheaper than group a and huge variety.
http://www.hogansracingmanifolds.com/im ... 75__2_.JPG
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