Nissan 370Z Forum - View Single Post

andre12031948 · 07-09-2012, 10:37 PM

I believe it's because CATS have much more material to them cause they surve a purpose/job like clean up the toxic stuff produced by combustion. HFC's are mostly thin, mostly straight through, so that ruspy combustion noise is no longer kept in check. Something like that.

Try running car without the exhaust system from HFC back. After a couple of days, put the exhaust system back up. The car now will sound much better.

07-09-2012, 10:37 PM	#11 (permalink)
andre12031948 Banned Join Date: Feb 2011 Location: monticello new york 127 Posts: 1,095 Drives: 08 350z black 6m/t Rep Power: 0	I believe it's because CATS have much more material to them cause they surve a purpose/job like clean up the toxic stuff produced by combustion. HFC's are mostly thin, mostly straight through, so that ruspy combustion noise is no longer kept in check. Something like that. Try running car without the exhaust system from HFC back. After a couple of days, put the exhaust system back up. The car now will sound much better. Last edited by andre12031948; 07-09-2012 at 10:40 PM.