It must be an injen thing... My girlfriends Mazda SP23 isn't much better LOL!
I personally prefer the Carbonio, I just like the product but I can't justify the additional $$$ for it. I had done a dyno before and after dyno of the addition of carbonio and apr catback which yielded solid midrange gains, it is also a lot more resiliant against heatsoak. I'd have to say that the the Neuspeed install is nicer though and I'd say that the gains would be comparable to the Carbonio.
Probably more personal preference at the end of the day
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