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Originally Posted by S14DB
Some cat-backs can affect Backpressure-EGR systems. They work off the exhaust pressure to work and when the pressure is droped with a cat-back they don't operate properly.
My 5zigen fireball keeps cracking at the resonator due to the small suport brakets. I was looking at going to the n1 or GT spec and now I don't know.
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By cracking you mean little backfire noises right? My N1 does a cool backfire popping noise when I slow down and the revs get to about 1250. I'm sure this is caused by what you explained but my car runs great, no problems. Sounds cool though, REALLY loud when the silencers are off!