i just got a dynomax high flow cat, 3" intermediate pipe, 40 series flowmaster muffler and dual 3" tips put on my car and it isnt even that much louder than stock.does it sound louder over time and just need time to break in or something. i hope so because i had a 80 series on a v6 firebird and it seemed louder than this.

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1986 WS6 pontiac trans am
5.0 305 TPI V8
700R4 tranny w/transgo shift kit. borg warner wires,accel cap and rotr,delco plugs, K&N
KYB shocks

"ponys can run but birds can fly"

 

itel get louder as u drive it, needs to be worked in

 

I think your cat may need worked in more. The Flowmaster has nothing that will affect sound over time. I mean there is nothing to burn out like glasspacks.



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Joshua Johnston
1991 Z-28
Flowmaster
K&N
305 / 5spd. (Temporary)
Soon to have:
350, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust, T&R Motorsports custom air intake

 

my 80 series got louder over time so your 40 series might too. The sound of the 40 series in my jeep never changed though.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship :
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

over time maybe it'll get louder. I have a 40 on my truck very loud I love it

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1988 Sport Coupe 305 TBI
K&N
Flowmaster exhaust


Daily driver:
1988 K1500 5.7 4x4 shortbed flowmaster cat-back gutted cat.
AOL: RyanNH84

 

I don't know, man. Just put a 40 series on my car with a 3" connecting pipe and the thing is alot louder than stock. As you can see from my name, we've got the same motor. Over tha past four days it has gotten louder though.Most likely it's the cat.

 

They do get louder with time. It took mine aprroximately 2 months.

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383 86 Camaro Z28
10.5:1compression Dart Pro 1 Aluminum heads 215cc>2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,3.42 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.

 

^ What they said. I LOVE Mine!

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1988 Jet Black IROC
5.7L W/ 64000 miles
Flowmaster Exhaust
Fully Loaded
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My IROC