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 Old 01-05-2016, 03:31 AM   #1
 
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Default Gen1 Cat-Back muffler

The in-cabin noise is ok-ish even though even with the Cobb hangars the mid resonator wants to touch the chassis a little which has an unpleasant impact on the cabin comfort, but with that pretty much addressed (when it gets too close I adjust it) I'm now after lowering the outside noise levels a bit as well as the noise the rear passengers get.

So did anyone fit a muffler to the gen1 Cobb cat-back and can share the dimensions? I'm debating between either fitting a small muffler there (the largest that can fit) or even a catalytic converter which should also tame down the noise a bit. I'm open to suggestions as well, anything else than "leave it as is", simply because the regulations will become stricter over night, probably some politicians are tired of hearing their children complaints about being smashed in their lamborghinis and ferraris every day in night illegal races by small turbocharged hatchbacks.
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2008 Cosmic Blue Mazda 3MPS
Bilstein B12 + CS Camber plates + Eibach camber arms, SSR Type-F, Michelin PS4 225/40/R18, Cobb RMM, StopTech Street Pads + Stoptech Slotted disks, SouthBend Enduro Stage3 clutch, genpu TMM + CS Insert, TheSpeedLine 2X Rear Cross Floor and Rear Middle Lower Strut bars, Tanabe 4 Point Under Brace, Whiteline Bumpsteeer corection kit
JBR Tru-3" + CS CAI Box, SU TMIC, Cobb XLE, NGK LTR7IX, UR v3 catted DP and res&catted TP, Cobb CatBack, GS EBCS, Autotech internals, GTX3071, CS 3.5BAR, Guardian Angel, CoolingMist WMI, VCTS Delete, stock ported IM
SP63 87.5mm 4032 9.5:1 pistons, Manley rods, CA625+ head studs, Clevite AL main bearings, King rod bearings, CP-e safe seals, DCR VVT, Koyorad radiator.
StratiVersaTuned FTW to 28PSI, self-tuned to 32PSI

2008 Icy Blue Mazda CX7 6 Speed Manual
SU TMIC, Autotech HPFP internals, Cobb XLE, Cobb EBCS, CorkSport 3.5BAR MAP
GTX2867R gen2, stock spark plugs, stock cats and stock exhaust FTW, JBR Tru-3" Silicone intake
TheSpeedLine Top and Lower Strut bars
self-Versatuned to 22PSI

Last edited by mituc; 01-05-2016 at 04:47 AM. Reason: typo corrected
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