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Most feel standard is best, with a replacement element.
I've got a Pipercross Viper IK on mine which make a noticeable improvement!
It's up to you though if you think it's worth the price though....
The supersprint manifolds are top notch and will make a noticeable improvement.
The problem (or maybe not) is the standard one is connected to the block iirc on some mount which obviously stabilises the movement of the manifold.
The s/s one doesn't have this and a lot of peoples concerns are...
Get a 2.0 filter on it instead of the 1.8 one.
Exactly the same inside, just the 2.0 is thinner and has a moulded top on so you can get a spanner on it for next time.