Cat removal with stock exhaust?

bmarcinczyk14 · 01-30-2013, 09:50 PM

I do not have the money for a full cat-back exhaust system but really would like to get some extra sound. Anyone know how replacing the oem cat's with straight pipes, lets say from fast intentions, and keeping everything else stock would sound? Can't find the specific setup on youtube. I don't want very loud, I want it to be noticeable though. I can't throw a CEL either for emissions purposes. Oh, I do not want a lot of rasp either, some is ok though. Any help is greatly appreciated!

NYBladeZ · 02-01-2013, 02:51 PM

It will be raspy bc you're using the stock exhaust but it will sound a lot better. You will also get decent gains. I think I posted a vid up here somewhere with the setup you're looking for.

Chuck33079 · 02-01-2013, 02:53 PM

Quote:

Originally Posted by bmarcinczyk14

I can't throw a CEL either for emissions purposes.

Then you're most likely going to have to get the car tuned after you take the cats off.

chrischhorn · 02-01-2013, 02:59 PM

Yup, with test pipes, the o2 extenders MIGHT work for you but you'll probably have to get them tuned out. Some states can actually see when the ECU has been modified and will automatically fail you. Unsure of Illinois emissions and equipment and if they put you on the sniffer, you will fail while hes walking up to put the thing in the exhaust lol.

SS_Firehawk · 02-01-2013, 03:12 PM

I would look at the member FS threads for deals on exhaust components. People here change their exhausts like they do underwear. There is a midpipe back 5Zigen exhaust for $400 floating around, some short tails, and other inexpensive options for quality parts. You will get the extra volume you want, spent little money and get no CEL.

cheshirecat · 02-01-2013, 03:18 PM

I would suggest going with some ART pipes and AAM short tails. Can probably get both used for ~$400

NYBladeZ · 02-01-2013, 03:51 PM

You can get cats for cheap and if they are engineered right you won't throw a cel. I ran GTM unreasonated test pipes, no tune but the sensors are set where no CEL came on.

Hotrodz · 02-01-2013, 09:16 PM

Quote:

Originally Posted by cheshirecat

I would suggest going with some ART pipes and AAM short tails. Can probably get both used for ~$400

I had this set up and it is extremely loud. If you just want sound, go with just the AAM short tails. If you want sound and performance get a aftermarket exhaust. I got an AAM 2.5" True Dual and I love it with my Art pipes.

Here is a link to my thread. There are many others! My Nismo w/ AAM Short-tail exhaust

bmarcinczyk14 · 02-01-2013, 10:57 PM

Thanks for all the feedback guys, I think I'm going to save a little longer and go with the FI catback with 12 inch resonators. I was going to get their HFC's as well, but decided the extra $500 is a little too much for me at the moment.

Leuz · 02-01-2013, 11:31 PM

Quote:

Originally Posted by Hotrodz

Here is a link to my thread. There are many others! My Nismo w/ AAM Short-tail exhaust

In the last vid your car sounds outrageous

Hotrodz · 02-02-2013, 10:43 AM

It was pretty wild...I really liked it but for a DD it got way too much attention and I want to keep what I have left of my hearing. LOL

Magic Bus · 02-02-2013, 03:12 PM

OP, you have similar concerns to me. Wanted a better sounding exhaust without breaking the bank, maintain all emission standards and not take a chance on voiding any warranties. Please keep in mind, I do not plan on doing any additional mods to my car, this is it, as far as the engine is concerned. Good info from jcosta on this link below.

Trying to understand the cumulative effect of breathing mods

Was initially planning on going w/Fast Intentions, cost w/shipping to HI is over $1,600, plus the local performance shop I would use for installation charge is $150. The owner of this shop would put on any exhasut I ordered for $150 but gave me two other options. Either one of these would cost only $400. Replace stock muffler w/two seperate mufflers from the last flange (this would cause 2 bends by the mufflers) or cut the existing pipes before the last flange and weld larger 2.5" pipes which attach to mufflers for a very straight exhaust flow. I chose option two, pic attached.

Very happy with my choice as this did not add any weight to my car, sound is much better than stock, original exhaust tips were kept, my butt dyno feels like their has been some increase in power, plus a savings of over $1,350. Might be an option for you.

NYBladeZ · 02-02-2013, 04:03 PM

OP don't overlook the fact that the stock cats rob some serious HP. I made ~293WHP on a dynojet after installing test pipes.

bmarcinczyk14 · 02-02-2013, 04:54 PM

Quote:

Originally Posted by NYBladeZ

OP don't overlook the fact that the stock cats rob some serious HP. I made ~293WHP on a dynojet after installing test pipes.

The resonated test pipe from FI is also a option, since it's relatively cheaper than their HFC's, but I wonder how much louder it will be then with the HFC's? I'll be getting the 18 inch resonators from them if I decide to go with either setup in order to keep the sound level livable. Will the tone be different between the two?

NYBladeZ · 02-03-2013, 12:43 PM

you might get a little less rasp with the hfc's but considering you're getting 18in. resonators it shouldn't be "unlivable" however if Chitown is hard on emission testing then get the HFC's

01-30-2013, 09:50 PM	#1 (permalink)
bmarcinczyk14 Track Member Join Date: Jul 2009 Location: Chicago Posts: 505 Drives: 2010 370z 6spd Sport Rep Power: 17	Cat removal with stock exhaust? I do not have the money for a full cat-back exhaust system but really would like to get some extra sound. Anyone know how replacing the oem cat's with straight pipes, lets say from fast intentions, and keeping everything else stock would sound? Can't find the specific setup on youtube. I don't want very loud, I want it to be noticeable though. I can't throw a CEL either for emissions purposes. Oh, I do not want a lot of rasp either, some is ok though. Any help is greatly appreciated! __________________ '10 370z -- '09 Ducati 848 -- '05 Kawasaki 636 Track Bike -- '02 Sentra SE-R Spec V

02-01-2013, 02:51 PM	#2 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	It will be raspy bc you're using the stock exhaust but it will sound a lot better. You will also get decent gains. I think I posted a vid up here somewhere with the setup you're looking for. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

02-01-2013, 02:59 PM	#4 (permalink)
chrischhorn A True Z Fanatic Join Date: Jan 2012 Location: Mililani, HI Posts: 1,566 Drives: 2014 Juke Nismo RS Rep Power: 16	Yup, with test pipes, the o2 extenders MIGHT work for you but you'll probably have to get them tuned out. Some states can actually see when the ECU has been modified and will automatically fail you. Unsure of Illinois emissions and equipment and if they put you on the sniffer, you will fail while hes walking up to put the thing in the exhaust lol. DEpointfive0 likes this. __________________ R.I.P. 8/01/13 1SlowZ One day I'll have another....

02-01-2013, 03:12 PM	#5 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	I would look at the member FS threads for deals on exhaust components. People here change their exhausts like they do underwear. There is a midpipe back 5Zigen exhaust for $400 floating around, some short tails, and other inexpensive options for quality parts. You will get the extra volume you want, spent little money and get no CEL. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

02-01-2013, 03:51 PM	#7 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	You can get cats for cheap and if they are engineered right you won't throw a cel. I ran GTM unreasonated test pipes, no tune but the sensors are set where no CEL came on. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

02-01-2013, 03:18 PM	#6 (permalink)
cheshirecat A True Z Fanatic Join Date: Jan 2009 Location: Florida Posts: 1,428 Drives: N54 135i Rep Power: 292	I would suggest going with some ART pipes and AAM short tails. Can probably get both used for ~$400

02-01-2013, 10:57 PM	#9 (permalink)
bmarcinczyk14 Track Member Join Date: Jul 2009 Location: Chicago Posts: 505 Drives: 2010 370z 6spd Sport Rep Power: 17	Thanks for all the feedback guys, I think I'm going to save a little longer and go with the FI catback with 12 inch resonators. I was going to get their HFC's as well, but decided the extra $500 is a little too much for me at the moment. __________________ '10 370z -- '09 Ducati 848 -- '05 Kawasaki 636 Track Bike -- '02 Sentra SE-R Spec V

02-02-2013, 10:43 AM	#11 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	It was pretty wild...I really liked it but for a DD it got way too much attention and I want to keep what I have left of my hearing. LOL __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

02-02-2013, 04:03 PM	#13 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	OP don't overlook the fact that the stock cats rob some serious HP. I made ~293WHP on a dynojet after installing test pipes. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

02-03-2013, 12:43 PM	#15 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	you might get a little less rasp with the hfc's but considering you're getting 18in. resonators it shouldn't be "unlivable" however if Chitown is hard on emission testing then get the HFC's __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DIY: Stock Catback Exhaust Removal	LinPark	DIY Section (Do-It-Yourself)	22	11-02-2016 05:25 AM
Stock knob Removal	Zeuz	Exterior & Interior	32	02-10-2012 02:36 PM
Help with Removal of Stock Cats	TongMan	Northern California Region	7	12-22-2011 08:46 PM
OEM exhaust removal clarification	FromG2Z	Intake/Exhaust	3	04-13-2011 08:58 PM
Removal of stock cats easy	SPOHN	Intake/Exhaust	13	03-02-2011 01:15 PM