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hi
I had the 335 remus axle back and wagner catless DP on my 328i
cold start sounded bad. rasp and unrefined.
Once warmed up and under light acceleration it was good.
but under heavy throttle and WOT it was very raspy and obnoxious and again unrefined.
maybe if i was in my 20's and wanted the attention i may have had a different opinion
I took it off the DP. Hoping to go high flow
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