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The airbox you mean?
You can feel the difference once fitted, they seem to pull harder. But yeh, they do respond very well to a proper map on Kpro/k100
Gruppe m is more top end power. Arc is great for mid range grunt, which is where the k20 needs help.
Depending on cost I'd have either tbh, but I do prefer the ARC
Nightmare! I had such a ball ache when I crashed the JDM. Had to send all the paperwork to them to prove it was an important, all the Japanese stuff etc. Stuck with it and eventually they paid out what I thought it was worth.
Although as it wasn't my fault, as above they were very quick in...