I just had LG's & Hiflo's added to my, oops, our '07 c6 A6. I had won a free tune so that was also done. I noticed the biggest difference in the shifting. Ours sucked before. You could eat lunch between shifts. I put the NPP's on last year. Love 'em. I paid $1450 but remember the tune was already paid for. Didn't have any other work performed either.
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