Here is the set up I plan to put on my car and I want to know if the set up would sound better with a cat delete or a high flow cat?

OTT 3in Exhaust without resonator, CTI Down pipe, and JBP Vortex Header.

 

Cat delete 4 sure.Plus its cheaper.

 

I think a cat costs you like 3 horse power, and makes your car not sound like ass. Plus, I dont care what anyone says about global warming, if you are putting less **** into the air, its better.

*note, this post is my opinion, so if you want to bitch at me, have a nice cup of STFU

 

Thats what I was thinking. It's not like the High flow cat will pass smog. So you save money and get 2 more horsepower. But my main concern is how it would sound. Do you have experience with catless cobalts?

 

i actually ran my car on a five gas emissions tester and even with a 3 inch catless downpipe, and megan cat-back, all of my emissions were within spec.

hydrocarbon gasses(spec of 300ppm)mine was 70.

Carbon monoxide(spec of 1.5% give or take .5%) mine was 1.8%.

Nitrogen oxide(spec of as close to 0ppm as possible) mine was 7ppm.

Carbon dioxide(spec of 10% and higher) mine was 17%

Oxygen levels were actually a little high but i have an exhaust leak so that would explain that and its not like oxygen is hurting the environment.

i would still fail emissions for not having a cat though. lol

 

Take your stock cat split it in half gut it and just weld it on the outside of your 3 inch that way when they look they will see a cat

 

I think I will go with high flow cat. I haven't been inpressed with the catless videos.

 

catless sounds like ass, get a cat, it's not going to gain or lose power.

 

Well thanks everyone I am getting a cat.

 

My catless 3" exhaust sounds amazing. No drone, no rasp, just a nice deep tone. Just make sure if you do go catless you get a quality one (CIA) and not a cheap crappy one.

Everyone goes cheap and wonders why their exhaust sounds like ****.

 

You know I will just buy both Cat pipe first and catless in the future.

 

Maybe look into the Hahn "MOD Pipe" @ www.TurboTechRacing.com

It maybe of interest to you and your needs.

 

what is this MOD pipe you speak of? theres no pictures...

 

catless on a ss/sc or any cobalt other than a turbo sounds like complete ass. if you're concerned about sound quality get a hi flow.

 

are you kidding me? a cat only robs a couple ponies? on our cars its more like 10-15, friend with a vette removed the cats and gained over 30 dyno proven horsepower. air flow through a cat is ridiculously hindered. for power, you want your exhaust as free flowing as possible, while keeping air velocity up. having a cat greatly restricts both. im not vouching for the sound however. most dont like it and im not fond of it. but to say the cat only takes 2-3 hp is misinformation

 

proof? i'll bet my life taking a cat off a cobalt is NOT good for anywhere near 10-15 hp. we're talking about the difference between a HI FLOW and no cat, not stock and no cat. and even from stock to catless no chance there's a 15 hp gain

 

if you dont believe me, just look at the inside of a catalytic converter and tell me that doesnt restrict airflow

i wish i would have dynoed my car before hand, but after just a catless downpipe i put down 245hp and 212 tq. granted it isnt saying much because i dont have an initial dyno. 15 hp is pushing it, but its definitely more than 2-3

 

looking and providing airflow #'s are 2 totally different things. you talk about misinformation, and then go on to say that a cobalt will gain 15 hp by changing the cat. now it's your turn to provide proof. and flow #'s are a better indicator of power gains. dyno's are pretty much worthless for accurately determining hp, especially when you're talking about less than 10 hp range. you can dyno 10hp more or less on the same day with nothing done differently to the car.

 

i have numbers, but i cant trust the source so i guess i have more digging to do.

 

ok. make sure they're hi flow, and the #'s for catless. also make sure the other components can flow more than the hi flow or catless, otherwise it doesn't matter.

 

well the numbers i have already are ~500cfm for a 3" downpipe with a high flow cat and then ~725cfm for the 3" catless downpipe. i would think all other compenents were the same as tested, but i am not sure so im not going to fight tooth and nail to say these are 100% true. i wasnt trying to start anything or any arguments.

 

i have a jbp header and a catless downpipe and it sounds good..
and it smells like you burning race gas haha

 

anyone gonna enlighten me on what a hahn "mod pipe" is?

 

https://www.cobaltss.net/forums/2-0l-lnf-performance-tech-153/hahn-mod-pipe-now-turbo-tech-racing-154132/

 

Thank you.