View Full Version : 3" mandrel bent exhaust


1BAD06MCSS
12-20-2010, 04:35 PM
Hey all! I was looking at getting this when my headers get in. Does anyone sell kits or could I just go to an exhaust shop and have them fab one up for me?

2005gxp
12-20-2010, 04:46 PM
im currently selling mine, but im in canada lol

monte_with_a_LS4
12-20-2010, 05:18 PM
you could get the slp. its cheaper than the magnaflow

1BAD06MCSS
12-20-2010, 06:47 PM
I like my magna flo's and would like to keep them. I just want to upgrade the piping before the mufflers. I have the basic magna flo kit. It's the 2.5 kit.

AlabamaGuy
12-20-2010, 07:30 PM
3 inch is the way to go.

indynotch50
12-21-2010, 09:25 AM
I went to a local shop, the guy there said it would be about $200 and some change maybe to run 3 inch from my header to my muffler, put the tips on and install an O2 bung.
This also comes from a highly recommended shop. However, it took some time. I went to 4 or 5 places before I found this one and was comfortable enough to let him work on my car (he said it would take 2 hours or so but he wanted an extra hour to be able to go through and make sure there weren't any quality issues).

DavidGXP
12-21-2010, 09:55 AM
Pacesetter has a kit fir the older grand prixs that will fit you would just need to replace the tips. But for 200 that's a steal. I paid over 700 for my custom setup

indynotch50
12-22-2010, 06:54 AM
That's just to run the piping and put my pieces together. With the headers, mufflers and tailpipes (which i have not found yet) I'll have well over that invested.

DavidGXP
12-22-2010, 10:55 AM
Adds up real quick lol

AlabamaGuy
12-22-2010, 01:12 PM
Adds up real quick lol

No kidding. Just talk to some of us that are on our 4th+ exhaust setup. I have enough money in my exhaust to nearly up and buy the cartuning kit. I'm still not done. It's getting closer to where I want it but it still isn't "right".

DieselPump
12-22-2010, 07:34 PM
No kidding. Just talk to some of us that are on our 4th+ exhaust setup. I have enough money in my exhaust to nearly up and buy the cartuning kit. I'm still not done. It's getting closer to where I want it but it still isn't "right".

I hear that, I'm in the same boat with how many times I've got it done.

Finally got exactly what I wanted about a month ago

Nacho SS
12-22-2010, 08:48 PM
No kidding. Just talk to some of us that are on our 4th+ exhaust setup. I have enough money in my exhaust to nearly up and buy the cartuning kit. I'm still not done. It's getting closer to where I want it but it still isn't "right".

Still sounds like a truck :lol:

AlabamaGuy
12-22-2010, 09:10 PM
Still sounds like a truck :lol:

It's actually very un-trucklike most of the time now. :D

evil 5.3
12-22-2010, 10:19 PM
how much on the bottom do you lose with 3 inch

GXP25
12-22-2010, 10:21 PM
how much on the bottom do you lose with 3 inch

I'd welcome some low-end torque loss.

AlabamaGuy
12-22-2010, 10:22 PM
I'd welcome some low-end torque loss.

No kidding...

evil 5.3
12-22-2010, 11:12 PM
ok then how much of a difference is it on the top end

AlabamaGuy
12-22-2010, 11:32 PM
It's one of those things that if you're going to keep modifying the car, you need to go ahead and get it out of the way. I don't have any numbers to back up my 3" exhaust.

evil 5.3
12-23-2010, 12:07 AM
well what about a seat of the pants dyno i have seen test that one 3inch is better flow wise then dual 2.5 now this was on a ls1 ss camaro in 98 or 99 The only thing is i know you can over exhaust a car and i dont want to make that mistake and i do want to keep modding i want a 12.99 out of the car n/a worst i spray the hell out it It happens

AlabamaGuy
12-23-2010, 12:09 AM
well what about a seat of the pants dyno i have seen test that one 3inch is better flow wise then dual 2.5 now this was on a ls1 ss camaro in 98 or 99 The only thing is i know you can over exhaust a car and i dont want to make that mistake and i do want to keep modding i want a 12.99 out of the car n/a worst i spray the hell out it It happens

Good luck with the 12.99 all motor.


Having said that, you can over exhaust a car but 3" isn't going to do it on a 325 cube motor spinning to 6000rpm.

Nacho SS
12-23-2010, 12:10 AM
It's actually very un-trucklike most of the time now. :D

I was in denial when I owned my monte carlo that it didn't sound like a truck.

The T/A changed my mind though. As for the 3" exhaust, do it. I had one fabbed for the car and with a catless DP (or headers), tune, HS 1.8s/pushrods/springs, it definitely felt like the car pulled better up top.

AlabamaGuy
12-23-2010, 12:15 AM
I was in denial when I owned my monte carlo that it didn't sound like a truck.


Wait, here's one.
http://www.youtube.com/watch?v=DpoWcmKm_HM

And yes, that is wheelspin at 35mph on DZ101s :D

evil 5.3
12-23-2010, 01:02 AM
i can do that on rsa's lol (such junk ) its quick

1BAD06MCSS
12-23-2010, 05:15 AM
So what most of you would recommend is to go to a shop and get one fabbed up?

indynotch50
12-23-2010, 01:28 PM
Oh, yeah since that was the original question... yes. Some have taken the magnaflow as a direct bolt on, some have taken gtp kits and modified, and others have just bought pieces. I think it all works out to about the same just depends on what you want to get into.
I recommend going to the custom route. However, with one very important caviat, find a shop you trust to do 3 inch. Not every shop can. Like i said, I went to 5 at least before I found 1 I felt comfortable with. And then I showed him my plan, after all he's the exhaust pro.

1BAD06MCSS
12-23-2010, 03:23 PM
What kind of shop? What do you look for? What are the qualities that I should look for?