View Full Version : quick question about dp on my application


NWAE Cobalt
02-02-2009, 02:42 AM
ok...so im going tomorrow to have a new downpipe and exhaust installed at clear image...im using my exhisting muffler and clear image tri y header....but the question. In the long run, will i show a worth while gain by going catless??? i know some people say its raspy...but what exactly do you mean by that. For my application as of now I have a CAI, 4--2-1 header and a tune plus it will have a 2.5" exhaust with a resonator and my muffler is a canister style magnaflow. Eventually im going to do a full engine build with a higher compression and staged comp cams.

Just wondering on ya'lls opinions...and i have to go in tomorrow morning...early...so ill post up what i decide :lol:

Bump

car_guy_09
02-02-2009, 02:57 AM
I would run a cat, I had no cat on my talon and it smelled like raw fuel anytime the car was running and i was always told it was because of no cat

NWAE Cobalt
02-02-2009, 02:58 AM
kewl kewl
thanks

REIGN SS
02-02-2009, 02:58 AM
http://www.cobaltss.net/forums/showthread.php?t=74012

car_guy_09
02-02-2009, 03:02 AM
http://www.cobaltss.net/forums/showthread.php?t=74012

You just had to link your thread didnt you?



:p:

MP Cobalt
02-02-2009, 07:53 AM
Run it with a cat I'd say just i case when you get your car inspected and if they look under and check there's something there

williamhvx1
02-02-2009, 09:29 AM
No Cat Here, But 3 Resanotors To Get To A Normal Driving Conditions, Gmpp Exhaust

Corvettespirit
02-02-2009, 09:41 AM
go with the cat on,reason emissions,go green save the planet:twothumbs

D4u2s0t
02-02-2009, 09:44 AM
No Cat Here, But 3 Resanotors To Get To A Normal Driving Conditions, Gmpp Exhaust

at that rate, should have just left the cat :lol:

my vote is to keep the cat. for the minimal gains you may see, it's not worth it for the awful sound imo.

KyleMinnis
02-02-2009, 11:09 AM
just get a highflow cat.

WhiteSSBalt
02-02-2009, 11:10 AM
No cat.

I likez loud.

copson20
02-02-2009, 11:16 AM
I would run a cat, I had no cat on my talon and it smelled like raw fuel anytime the car was running and i was always told it was because of no cat

The type of cat that Dan at Clear image installs is a 525cfm High flow cat the you'll get that smell no matter what.

umrdyldo
02-02-2009, 12:28 PM
The type of cat that Dan at Clear image installs is a 525cfm High flow cat the you'll get that smell no matter what.

That's the truth, my hi-flow cat smells like fuel all the time.

Nato09
02-02-2009, 04:39 PM
No cat = sounds terrible and i doubt you'll pass emissions.

NWAE Cobalt
02-02-2009, 08:27 PM
ill have it tuned out. when i got there they hadnt gotten thier shipment of cats in...so i am now catless :lol:
he had already bent the pipe for 3"...so we did a 2.5" dp with a magnaflow resonator, 3" exhaust piping with my existing 2.5" muffler...so i do get backpressure, but the exhaust is also ready for future upgrades if needed.

D4u2s0t
02-02-2009, 08:43 PM
ill have it tuned out. when i got there they hadnt gotten thier shipment of cats in...so i am now catless :lol:
he had already bent the pipe for 3"...so we did a 2.5" dp with a magnaflow resonator, 3" exhaust piping with my existing 2.5" muffler...so i do get backpressure, but the exhaust is also ready for future upgrades if needed.

sigh... again... you don't want backpressure :lol: what do you have planned in the way of mods? 3" is way too big unless you're going turbo. unless you're doing a HUGE n/a build it will be too big.

also as far as emmisions, make sure they don't do a visual test. i had a buddy that welded a heat shield on so if you take a look under the car, it LOOKS like there's a cat there :lol:

NWAE Cobalt
02-03-2009, 02:11 AM
sigh... again... you don't want backpressure :lol: what do you have planned in the way of mods? 3" is way too big unless you're going turbo. unless you're doing a HUGE n/a build it will be too big.

also as far as emmisions, make sure they don't do a visual test. i had a buddy that welded a heat shield on so if you take a look under the car, it LOOKS like there's a cat there :lol:
nice idea..lol
i am going to be doing a FULL n/a build...higher compression, all internals, port and polish heads, everything i can do.

Nato09
02-03-2009, 08:34 AM
i have an lsj downpipe with deleted cat if anyone is interested.