Did an entire exhaust delete, catback

[lemontwist]

i am going to be a party pooper and sound like a tree huger.....it's against federal law to remove the cats.the muffler shop should have pointed that out,around here they won't remove them for you ya got to do it yourself but they will do a exhaust without them.we have emissions inspection in NC and i actually don't mind cats.
teeth before you do anything else drastic ask around here the members are glad to give some what i would call good advise.
i would only go back to that muffler shop to get that exhaust put back on i think they are hacks and were probably laughing about the guy that just payed them to ruin his car after that never go back there LOL. i was a mechanic long ago i think they should have looked at what you had told you that was like a 1500 dollar cat back set up and un-caped the j pipes you may have been happy with that. i haven't done it but from what i have read here long tubes make a huge difference in sound and power. i imagine you are on a limited budget and wanted a cheap mod,the 5th gens SS even with high miles are not what i would call cheap cars to buy.

[Danial]

Originally Posted by lemontwist

i am going to be a party pooper and sound like a tree huger.....it's against federal law to remove the cats.the muffler shop should have pointed that out,around here they won't remove them for you ya got to do it yourself but they will do a exhaust without them.we have emissions inspection in NC and i actually don't mind cats.
teeth before you do anything else drastic ask around here the members are glad to give some what i would call good advise.
i would only go back to that muffler shop to get that exhaust put back on i think they are hacks and were probably laughing about the guy that just payed them to ruin his car after that never go back there LOL. i was a mechanic long ago i think they should have looked at what you had told you that was like a 1500 dollar cat back set up and un-caped the j pipes you may have been happy with that. i haven't done it but from what i have read here long tubes make a huge difference in sound and power. i imagine you are on a limited budget and wanted a cheap mod,the 5th gens SS even with high miles are not what i would call cheap cars to buy.

Actually, it's against the law for a dealership or shop to remove them - the owner can do whatever he likes to the car. But then if you live in a city or county where you have to pass smog to get tags, that could be an issue.

[Greenhornet2]

He still has cats

[Danial]

Originally Posted by Greenhornet2

He still has cats

And then there's that.

[Teeth]

I made sure to at least keep the cats in the exhaust. I could x-pipe it from here or straight pipe, either one is alright for what I want with the car, because other performance things would come later.

[lemontwist]

Originally Posted by Teeth

I made sure to at least keep the cats in the exhaust. I could x-pipe it from here or straight pipe, either one is alright for what I want with the car, because other performance things would come later.

you have the x pipe with he exhaust you have/had.all you need to do is loosen the band clamps in front of the mufflers and they come right off then you could just do a axle back with out mufflers.
https://www.jegs.com/i/MBRP/679/S702...hoCTgkQAvD_BwE

[MrChrisLS3]

Originally Posted by Teeth

I made sure to at least keep the cats in the exhaust. I could x-pipe it from here or straight pipe, either one is alright for what I want with the car, because other performance things would come later.

I would have the shop weld it back up. (Although I don't know I would trust that shop considering how close they cut to o2's) You can get some muffler delete pipes for the axle back. You should be plenty loud with that, and won't have to worry about passing out at a railroad crossing or in a traffic jam. Do not let them cut the mufflers off, that's the most expensive part of this exhaust set up, cut it and the value drops almost to nothing.

Take your time. Think about what you want to accomplish with the car, the overall package. Modding a car can get really expensive when you have to go back and fix mistakes. Also, a mish mash of random mods can actually lower performance. In today's computer controlled engines, everything has to work together. Like right now, you're probably running rich because the computer is dumping all the fuel it can to overcome a false lean condition the o2 sensors are sending, because they're exposed to the open air.

Mod for power first, sound second. If it's going to sound mean, it ought to be mean. Though, if you plan to supercharge it or put a cam in it, go ahead and get the long tubes. That way you can tune with the proper exhaust in one shot.

[Axe55]

I would not recommend going back to the shop that did this in the first place. They're supposed to be professionals, they should have at a minimum, been able to tell you to remove the exhaust at the clamps instead of cutting it off. They don't sound trustworthy to me, and finding a good shop can make a huge difference when you start modding your car and you don't do it yourself. It will give you peace of mind both when you're spending your money there and when you're having fun at WOT.

As a fellow newbie on the forums and to the mod game, I can echo all the comments about asking questions here. I have asked a few questions and read a lot before starting my own mods, there is a lot of knowledge and experience on these forums.

[mikeman]

Don't just straight pipe it like that. It'll sound like a motor boat at full throttle. At least do an X pipe or something.

[pyroguy]

Originally Posted by Teeth

When do you guys think I should take care of all of this? Will I be able to put the process off for a few months or so?

No, just ride around for a few months with CO sitting under your cabin seeping into the cab at every red light. No big deal, just pray leaving the windows down airs it out.

Originally Posted by Teeth

I do have another question to ask though, what do you think is the HP loss with something like this, and do you think a straightpipe to at least get the exhaust away from the cabin would work well enough until I can get the money to upgrade the system fully?

I was told that the old system could be sold for a good chunk of change, which is a thought I was having, since it would allow me to do a few other MUCH smaller things to the car.

The problem isn't the hp loss as much as the car's computer thinking the mixture of air and fuel is off and your car may end up running too lean or too rich. Too rich isn't as bad as too lean, but either could cause significant damage to the engine.

As for the old exhaust, Borla is definitely a top notch system. It has some J pipes from Solo welded in so you should be able to be drone free which is always a good thing. I'm sure someone might pay upwards of $500 for it.

[notjustin666]

can u pls add a video of it starting up or something i really want to hear how loud it is lol

[Excavator3000]

lawl

[Teeth]

Originally Posted by MrChrisLS3

I would have the shop weld it back up. (Although I don't know I would trust that shop considering how close they cut to o2's) You can get some muffler delete pipes for the axle back. You should be plenty loud with that, and won't have to worry about passing out at a railroad crossing or in a traffic jam. Do not let them cut the mufflers off, that's the most expensive part of this exhaust set up, cut it and the value drops almost to nothing.

Take your time. Think about what you want to accomplish with the car, the overall package. Modding a car can get really expensive when you have to go back and fix mistakes. Also, a mish mash of random mods can actually lower performance. In today's computer controlled engines, everything has to work together. Like right now, you're probably running rich because the computer is dumping all the fuel it can to overcome a false lean condition the o2 sensors are sending, because they're exposed to the open air.

Mod for power first, sound second. If it's going to sound mean, it ought to be mean. Though, if you plan to supercharge it or put a cam in it, go ahead and get the long tubes. That way you can tune with the proper exhaust in one shot.

Originally Posted by Axe55

I would not recommend going back to the shop that did this in the first place. They're supposed to be professionals, they should have at a minimum, been able to tell you to remove the exhaust at the clamps instead of cutting it off. They don't sound trustworthy to me, and finding a good shop can make a huge difference when you start modding your car and you don't do it yourself. It will give you peace of mind both when you're spending your money there and when you're having fun at WOT.

As a fellow newbie on the forums and to the mod game, I can echo all the comments about asking questions here. I have asked a few questions and read a lot before starting my own mods, there is a lot of knowledge and experience on these forums.

Originally Posted by mikeman

Don't just straight pipe it like that. It'll sound like a motor boat at full throttle. At least do an X pipe or something.

Originally Posted by pyroguy

No, just ride around for a few months with CO sitting under your cabin seeping into the cab at every red light. No big deal, just pray leaving the windows down airs it out.



The problem isn't the hp loss as much as the car's computer thinking the mixture of air and fuel is off and your car may end up running too lean or too rich. Too rich isn't as bad as too lean, but either could cause significant damage to the engine.

As for the old exhaust, Borla is definitely a top notch system. It has some J pipes from Solo welded in so you should be able to be drone free which is always a good thing. I'm sure someone might pay upwards of $500 for it.

Well obviously I wouldn't just have the pipes sitting right there now, I'm more than likely going to x-pipe the thing and send them back to the rear axle at least, with a turn-down tip or something. Might also put in resonators just to stop the drone.

I'll sit on that for a few months and see how it goes. Longtubes are definitely the next thing I'm going to swap into the car though.

[Chris49066SS]

Originally Posted by pyroguy

No, just ride around for a few months with CO sitting under your cabin seeping into the cab at every red light. No big deal, just pray leaving the windows down airs it out.

The problem isn't the hp loss as much as the car's computer thinking the mixture of air and fuel is off and your car may end up running too lean or too rich. Too rich isn't as bad as too lean, but either could cause significant damage to the engine.

Heres mine


I was running this a while back and liked it. Windows down at stoplights was a must for carbon monoxide considerations, but the smell was never anything bad, and the volume was nice. Mine was tuned for open headers though, and the dumps offered just enough distance between the O2 sensors and open air to tune it. My tuner Ryan at GPI has a very similar exhaust setup..his pipes are just a bit longer. Heres how it sounds like this (and yes, I botched the launch pretty bad and the RPMs were up around 7800)