ERZ to motordyne ART pipes

triadz

Yes the conversion was done, just waiting for my retune to get a good comparison. I also switched my k and n intakes to the stillen gen 3's, I actually had another dyno done but that was with the tune for the k and n intakes and erz test pipes, before the conversion it put down 298, and after was 290 but that was with the other tune, I'm going to my shop to get retuned tomorrow will make another update. With that being said is it common for me to get those lower numbers with the supposedly better parts in the stillen and art pipes because it was tuned for other parts?

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H and R springs, top speed cat back, motordyne art pipes, stillen gen 3.