[321freeflow]

There's no doubt the std offering is too small for the Supercharged cars - I'd say it's too small for the n/a motor too!
Here's a pic showing the std header alongside the 2bular std and the 2bular big-bore (for 300+ outputs - brave).
Apart from the obvious increase in bore size THE most important design feature on the 2bular(s) is the proper flexy section - absolutely essential IMO. To fit a spring-loaded joint on the n/a cars is bad enough but to continue its use on the Supercharged motors is unforgiveable. It's cheap and nasty. There's waaaay too much engine movement for that component to withstand the stresses.

btw the std 2bular header weighs the same as the Lotus offering. The big-bore is 1lb heavier.