A curious exhaust question...

[nightspeed87]

My car has no cat, but stock pipeing, and my car is in the process of a n/t to a gst engine swap and look in my profile on whats done to the engine. Now, is the n/t exhaust pipeing under the car smaller than the gst's exhaust pipeing... Like in the diameter and thickness of the pipe. I have 3 in exhaust system (muffler and pipeing) that I bought but its going to take like 3 weeks to get here and im thinking maybe I should just cut the pipe off under the car after the first resonator so theres not too much back pressure in the meantime.? Will this be ok, I already have no cat on the car, I just dont want to have too much back pressure from n/t piping and want to have some power in the meantime while I wait for my 3 in set up. Is it going to be extrememly annoying loud. Ive heard turbo'd cars dont carry such a loud annoying, ( and illegal ) exhaust note as n/t cars do, so will I get away with the cars sound decibles not being too loud cutting the pipe off after the resonator, or will it be unbearable loud for everyday street driving.

 

[prplhz96]

I would wait for the exhaust if I were you. You really dont have a choice, being as your NT exhaust will no way, shape or form bolt up to your O2 housing.

 

[nightspeed87]

oh no sorry for that misunderstanding I have the gst down pipe and a gst test tube to connect to that,and can connect the longer sound resonator, I just dont think it will connect the rest of the way. So what if I just left the rest of the exhaust missing in action after that resonator until I get the 3in?

 

[19Eclipse90]

I ran my exhaust off the downpipe for a couple days. Needless to say, I was hit with a 'Defective Exhaust - TOO LOUD' ticket. I don't advise cutting anything, you are better off, in more ways than one, leaving it be until you get your new setup.

 

[95TalonOwner]

I ran all winter with an open dp on my 91 laser and never got pulled over once and I live in the middle of the city. I guess in Milwaukee the cops are preoccupied with homicides and other things of that nature .

If it was me, I would just leave the rest of the exhaust off until your 3 in. comes. I love the sound of an open dp with a turbo spooling.

 

[nightspeed87]

I ran all winter with an open dp on my 91 laser and never got pulled over once and I live in the middle of the city. I guess in Milwaukee the cops are preoccupied with homicides and other things of that nature .

If it was me, I would just leave the rest of the exhaust off until your 3 in. comes. I love the sound of an open dp with a turbo spooling.

Hmm.. So you was running just downpipe? Like out a scale of 1- 10 what would you judge it in loudness? Louder than the average honda guy flying around?
Did the loudness vary by it being under boost/ not under boost, and was the
exhaust note still deep? Just trying to get the
full scoop on doing it like that before I do. And im not cutting nothing I was just going to drop the tailpipe after the flange on the resonator, so it would basically be discontinueing after the longer resonator. Maybe that should make it slightly quieter than you guys? DId either of you notice any significant power gains after doing this?
Sorry to ask so many questions just trying to be thorough.

 

[95TalonOwner]

Exhaust note was deep, louder than a honda guy, normal driving loudness was maybe 6-7, under boost it was definately a 10. There were definately power gains since there was almost no restriction, much more gain on the top end.

You could just unbolt it, drive around for a couple minutes and see if you like it. It's only for three weeks anyway, but I'm not responsible for any modified exhaust tickets.

 

[kawboy]

In Florida, you are very likely to get pulled over for running with an open downpipe. On the other hand, if you keep throttle levels down, you might be able to get away with it for those 3 weeks you are waiting. If the open downpipe is too loud, and you still want to drive, I'd reccomend just putting on the N/A exhaust system and making it fit. Sure, you'll loose some power, but you don't go running around the streets thinking you're speed racer anyways, do ya?

 

[Marc91GSX]

For the most part the N/T exhaust and turbo exhaust is the same on 1gs. The only difference is from the cat forward. If you have the exhaust from the cat forward for a turbo car then you can bolt it up to the exhaust that is already on the car.

 

[19Eclipse90]

The power gains are definitely there when running open downpipe.
HOWSOMEVER... what is three weeks with a smaller exhaust? You know if you drive around like that, then when you put that new setup on it will feel that much faster. Personally I don't see the point in risking a ticket over this. It's not like you are going to be dog slow with it on. You want to go that fast? Go to the track and unbolt the d/p. There you can go as fast as you want and do it legally. And when you are done, you can bolt it back up and be fine on the drive home. Three weeks with a smaller exhaust is safe, while three weeks of open d/p is risking it every time you start your car. The idle is extremely loud, revs make it sound like a dragster V8, it is LOUD. After I got pulled over, I had to engage in first gear with the clutch only, to keep the noise level down, and that didn't help much at all.
It is up to you though, if you are feeling lucky and want to do it, there is no one stopping you.
I still, speaking from experience, would keep my small exhaust on.

 

[nightspeed87]

well you are starting to convice me.

So you did that to a turbo laser then huh? not your n/t in the pic.
I think that exhaust are louder on n/ts than on t's because of the disruption in the exhaust from the turbo, because I hear most n/t guys much louder.
Anyways I didnt think it would be that loud, I thought it would just sound like any car with straight pipe and a muffler and no cat which is loud but still bearable to get away with.
I guess I will just unbolt it and see how it sounds, and if its too loud bolt it back up.
I didnt think that the n/t and the gst had the same thickness of exhaust pipe under the car, I was under the impression that the n/ts tail pipeing was actually smaller but if there the same and thats the case im not so worried about just connecting the turbo downpipe to the n/t pipeing and running like that for 3 weeks. I already have a straight pipe were the cat goes and a 2.5 inlet muffler so that should be ok for now ( maybe better than stock then right? )

 

[Gs Dewd]

okay since I have actually done this swap the piping is actually bigger on the n/t cars. I have the awd pipes that came off my doner car to prove it. But the n/a cars have 2 resinators in the exhaust. Cut those out and and replace with straight pipe you will be fine.

 

[nightspeed87]

okay since I have actually done this swap the piping is actually bigger on the n/t cars. I have the awd pipes that came off my doner car to prove it. But the n/a cars have 2 resinators in the exhaust. Cut those out and and replace with straight pipe you will be fine.

HuH? bigger on n/ts? Wow thats unexpected.
Well How does it sound with/ without the resonators on the turbo engine?
I know without any of the resonators on a n/t it sounds like sh*t.
So basically Im ok leaving my n/t pipeing until I get a 3 in exhaust set up
( remember I already have a muffler just not 3in, and a straight pipe were the cat is)

Since you did this swap is it ok I messenge you sometimes because I am about to
start the wiring part. Look on my profile to see my mods to the engine.
But I do have a few questions about the wiring.
Did you have any problems afterwards, or was it smooth and problemless.