question on downpipes
question on downpipes ok i dont have much knowledge on down pipes. when spring hits i will be putting my mods back on ( CAI, shift kit, HP tune, exhaust )
i would like to go with a downpipe. i want a louder exhaust tone and am wondering if i should get a high flow cat or no cat. if i go with a high flow will it improve performance and make exahust sound a lil louder or no? and what size should i get. isnt 3inch only good if you are supercharged? i want to keep my resinator on this time around so my exhaust doesnt get raspy like it is without it and thought maybe a high flow cat down pipe or no cat down pipe would make it louder without raspy. thanks guys.
i would like to go with a downpipe. i want a louder exhaust tone and am wondering if i should get a high flow cat or no cat. if i go with a high flow will it improve performance and make exahust sound a lil louder or no? and what size should i get. isnt 3inch only good if you are supercharged? i want to keep my resinator on this time around so my exhaust doesnt get raspy like it is without it and thought maybe a high flow cat down pipe or no cat down pipe would make it louder without raspy. thanks guys.
TECH Enthusiast
Joined: Jan 2008
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From: Missouri
High Flow Cats give 99% of the power, with about 80% of the sound of a catless system. The Hogan 3" downpipe seems to be the popular choice around here. Not that I know where to get it. If anyone can provide a link, I'd appreciate it.
TECH Enthusiast
Joined: Apr 2007
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From: Hudson River Valley, NY
www.wbodystore.com
I just ordered mine yesterday...
http://www.wbodystore.com/grandprix/...-v8-p-219.html
:-)
I just ordered mine yesterday...
http://www.wbodystore.com/grandprix/...-v8-p-219.html
:-)
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I did a video of both the stock OEM downpipe vs the Hogan with High flow cat. It does wait the car up,but not as much as if you got headers to go with the pipe.
IF you really want to wake it up, talk to Milzy and have him make you some headers.
IF you really want to wake it up, talk to Milzy and have him make you some headers.
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Staging Lane
Joined: Jan 2008
Posts: 92
Likes: 0
From: Chicagoland area
ok i dont have much knowledge on down pipes. when spring hits i will be putting my mods back on ( CAI, shift kit, HP tune, exhaust )
i would like to go with a downpipe. i want a louder exhaust tone and am wondering if i should get a high flow cat or no cat. if i go with a high flow will it improve performance and make exahust sound a lil louder or no? and what size should i get. isnt 3inch only good if you are supercharged? i want to keep my resinator on this time around so my exhaust doesnt get raspy like it is without it and thought maybe a high flow cat down pipe or no cat down pipe would make it louder without raspy. thanks guys.
i would like to go with a downpipe. i want a louder exhaust tone and am wondering if i should get a high flow cat or no cat. if i go with a high flow will it improve performance and make exahust sound a lil louder or no? and what size should i get. isnt 3inch only good if you are supercharged? i want to keep my resinator on this time around so my exhaust doesnt get raspy like it is without it and thought maybe a high flow cat down pipe or no cat down pipe would make it louder without raspy. thanks guys.
M/T link describing what the GM Performance Division guys did: http://www.motortrend.com/roadtests/...r_first_drive/
Last edited by jpstax; Mar 8, 2008 at 09:34 PM.
Staging Lane
Joined: Jan 2008
Posts: 92
Likes: 0
From: Chicagoland area
A GM mechanic told me mufflers for all FWD (LS4) cars are "40 Series Delta" Flowmasters. I think he's right, because the exhaust note for my '08 Buick Super sounds almost identical to this sound clip, only softer:
http://www.flowmastermufflers.com/40_delta.html
http://www.flowmastermufflers.com/40_delta.html
Last edited by jpstax; Mar 11, 2008 at 12:00 AM.
Staging Lane
Joined: Jan 2008
Posts: 92
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From: Chicagoland area
Why would he be dreaming? It says the Flowmaster 40 Series Delta Flow application is for late-model performance cars with dual exhaust. The GM Performance Division outsourced some parts for the LaX Super (Bilstein struts, Delphi steering gear, Bose radio, etc), so why not the mufflers? I wouldn't be at all surprised if Chevy and Pontiac's engineers did too for the Impala SS and Grand Prix GXP. Don't forget the Corvette Z06 and Caddy CTS-V use Brembo brakes.
Staging Lane
Joined: Jan 2008
Posts: 92
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From: Chicagoland area
http://www.youtube.com/watch?v=7PIgEt2cwXY
However, it doesn't say which Flowmasters were installed. They sound a lot louder than my LaX Super's and the Impala SS I test drove. They could be the Super 40's, not the 40 Series Deltas.
Last edited by jpstax; Mar 11, 2008 at 02:00 PM.
Because if they did we would know. Notice how when they outsource those parts they put the names all over as you listed above. Yes the Impala, Monte, and GP have the same parts. Do you see that anywhere on an official GM publication that these cars use 40s, no. Why? Because if they paid for the name they would use it to sell cars...
Trust me, it makes sense...
And comparing by sound, eh no...
Think about it, just because my neighbor and I sound the same on the phone doesn't mean we both get to bang my gf....
Trust me, it makes sense...
And comparing by sound, eh no...
Think about it, just because my neighbor and I sound the same on the phone doesn't mean we both get to bang my gf....