Unusual Rattle/Buzzing Noise from Exhaust – 2010-2015 Mazda CX-9

2010-2015 CX-9 – UNUSUAL RATTLE / BUZZ TYPE NOISE FROM PRE-SILENCER

APPLICABLE MODEL(S)/VINS

2010-2015 CX-9

Unusual rattle/buzzing type noise from the presilencer when driving at approximately 1800 rpm.

The lower (rear-side) of the pre-silencer may be thermally deformed due to insufficient rigidity (fewer weld spots). The deformed portion may resonate exhaust gas pulsations, which causes noise.

A reinforced plate has been added to the pre-silencer to increase the rigidity, thereby eliminating deformation.

REPAIR PROCEDURE

1. Replace the presilencer (A). Refer to MS3 online or Workshop Manual (section 01-15).

PART(S) INFORMATION

Part Number	Description	Qty.
CA11-40-300C	Presilencer	1
AJ17-40-305 Genuine OEM 2007-2013 For Mazda CX-9 exhoust System Pre-Muffler Gasket AJ17-40-305 AJ1740305 This is a genuine Japanese part 2007-2013 For Mazda CX-9 exhoust System Pre-Muffler Gasket Part number: AJ17-40-305 Please verify the compatibility before making a purchase To ensure fitment, match the part number or provide us your VIN Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-19 / Affiliate links / Images from Amazon Product Advertising API	Gasket	1
FSB8-40-305 Genuine Mazda FSB8-40-305 Exhaust Gasket Product Type :Auto Part Package Dimensions :11.0" L X7.0" W X3.0" H Package Weight :2.0Lbs Country Of Origin :China Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API	Gasket	2

358 Reviews

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• Please measure your own pipe and bumper cutout, and compare to this product fitment size.
• This exhaust tips fit pipes measuring between 1.75 and 2.5 inches in diameter.
• Size : / Length 6'' / width 3'' / Inlet Diameter 2 3/4'' / Outlet Diameter 3''
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Buy on Amazon Price incl. tax, excl. shipping

Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API

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