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Discussion Starter · #1 ·
Hey guys just replaced the stock downpipe with an old japspeed equal length stainless downpipe and replaced the cat with a mild steel decat because it came with it... From the cat back is a stainless steel japspeed shotgun system...

it sounded good and clean before I changed the downpipe and decat...

My question is will having a complete stainless system with a mild steel decat cause a nasty raspy sound in some places through the rpm range... It's gross but when it's not raspy it sounds good and I can hear the turbo spool up and down
 
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