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BeckyD @ James Martin Chevy

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Old 05-19-2019, 06:08 PM   #141
cbr1100xx's Avatar
Drives: '14 Jetta 1.8, '19 1SS
Join Date: Mar 2010
Location: San Diego
Posts: 589
Precisely why I didn’t get NPP and put a Borla axle back on.
'19 1SS A10 SGM, Borla S-Type axle back.
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Old 05-20-2019, 01:46 PM   #142

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Drives: 2016 Camaro 1LT
Join Date: Jan 2016
Location: California
Posts: 2,703
If you still have the rattle issue and it doesn't seem related to the npp valve, it could be the resonator that comes before the muffler. It is not uncommon for welds around the drain hole or inside to crack and create a horrendous metal tin can sound.
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Old 06-10-2019, 06:46 PM   #143
Drives: Chevrolet 1SS 1LE
Join Date: May 2019
Location: LA
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Has anyone seen this new alleged NPP fix? Anyone tried it?
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File Type: pdf #18-NA-172 - Rattle Type Noise Heard from Rear of Vehicle - (May 16, 2019).pdf (177.3 KB, 19 views)
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