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Sorry but i dont agree. Imo there is very little to no variation to AEM's cai or Injen's or K&N's or any other really tbh. I know Tegiwa copied the Gruppe M design, but they didnt patent it so why not? There are lots of different copies of original tuning parts, but the Tegiwa is just as good as the GM but half the price new. So really unless you want to have the Gruppe M name on your kit, i dont see why people as you say, turn their nose up at it. Good ideas always get copied, and in some cases the copy ends up better than the original.
The Tegiwa certainly isn't better than the GruppeM, you only have to look at the quality of the carbon used between the two kits to see which one is superior.