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-   -   New exhaust coming soon.... (https://www.gtcarz.com/chevy-gmc-70/new-exhaust-coming-soon-101283/)

Drake 02-13-2006 01:48 AM

New exhaust coming soon....
 
I really didn't want to replace my exhaust system, but it looks like I will have to. Since my entire system is welded together (even my headers are welded to the ory), there is no flex in the pipes which is ruining my headers. The header tubes are starting to pop the welds that hold them to the flange that attached to the engine.

So, I took it to a shop in San Antonio that I know real well to see what they could do. I've always wanted the true duals, but I didn't like the idea of dumps before the axle. This shop is gonna build me a custom true dual exhaust system that goes over the axle and out the rear next Monday. :cool:

While I am pissed my new PC money is going towards exhaust, it'll be nice to finally have a good system on my car.

Mike Jones 02-13-2006 02:07 AM

While the duals will be awesome it sucks the guy who install the last exhaust welding it all together. I don't understand why you would weld the header's to the ORY.

Drake 02-13-2006 02:13 AM


Originally Posted by ProjectCamaro
While the duals will be awesome it sucks the guy who install the last exhaust welding it all together. I don't understand why you would weld the header's to the ORY.

Well, thats mostly my fault. When I first got the car the headers weren't clamped to the ORY very well and as a result I would get a sound like a gunshot every now and then.....very annoying. At the time I didn't know much at all about cars (other than appearance issues), and so I took it to a local exhaust shop to get it fixed. They told me that they couldn't clamp it for some reason but that they could weld it. I said, sure why not. In retrospect I realize that was a bad idea......had the guys at the shop bothered to tell me that welding it would cause my system to crack over time because it didn't have any room to flex, I wouldn't have done it.

But oh well, at least now I have a reason to get true duals right? :)

Mike Jones 02-13-2006 02:14 AM


Originally Posted by Drake
But oh well, at least now I have a reason to get true duals right? :)

Way to look on the bright side, are you getting new header's as well?

paarman97maro 02-13-2006 02:16 AM

sucks in some aspects, but good to hear youre getting true duals :cool:

mxracerbrian 02-13-2006 02:50 AM

youve gotta be excited!! i would!!!

Drake 02-14-2006 12:24 AM


Originally Posted by ProjectCamaro
Way to look on the bright side, are you getting new header's as well?

I think they are going to be able to repair my Pacesetters. I really don't want to buy new headers.

I just got a call from them today. $550 w/ it dumped before the axle, or $875 with it going over the axle. Is it just me, or is that a HUGE price jump? It can't be that much more piping, can it?

I don't know what to do. I don't want it dumped before the axle.....but I also don't wanna pay that much either. :(

Bernotas05 02-14-2006 12:32 AM

wow thats alot way to much

97z2801ss 02-14-2006 12:40 AM

yea kinda expensive

Mike Jones 02-14-2006 12:53 AM

Ouch, that's up to you but if you don't go all the way to the back you will regret it.

Drake 02-14-2006 01:15 AM


Originally Posted by ProjectCamaro
Ouch, that's up to you but if you don't go all the way to the back you will regret it.

I agree. $875 sounds like a lot, but they build these systems from scratch.....so its a personalized custom system. I just cannot believe the price difference between the dumps & over the axle.

blue89vert 02-14-2006 12:29 PM

Yikes! Well if you do it it would be worth every dollar....i think

mxracerbrian 02-14-2006 01:43 PM

i agree! it would be sweet!

Jpack 02-14-2006 02:54 PM

Well if you decide on dumping at the axle, for the price this can't be beat.

http://cgi.ebay.com/ebaymotors/98-02...spagenameZWDVW

http://cgi.ebay.com/ebaymotors/98-02...spagenameZWDVW

http://cgi.ebay.com/ebaymotors/98-02...spagenameZWDVW

mxracerbrian 02-14-2006 03:46 PM

those are really cheap!! (price)

Mike Jones 02-14-2006 11:57 PM


Originally Posted by Jpack

Wow those are some incredible prices, I might just buy one of those but instead of the dumps have it curve out the side for my side exhaust. Just a little cutting and welding to make it the correct length.

Jpack 02-15-2006 06:38 PM


Originally Posted by ProjectCamaro
Wow those are some incredible prices, I might just buy one of those but instead of the dumps have it curve out the side for my side exhaust. Just a little cutting and welding to make it the correct length.

And you wondered how i always get exhausts for cheap. I am the king of bargin shopping....lol. Any part....... anywhere, I will find the best price. :lolsign:

69z-28 02-15-2006 08:08 PM

that is a nice looking system but i wonder how well it fits.

V6Cam 02-15-2006 09:43 PM

Yeah that is a big price jump, have you checked with other shops to see what their price would be...

Bernotas05 02-15-2006 10:06 PM

Yea thats not a bad price, id rather them exit out the back though. If i dont lower my car im goin to go true duals with chambered exhaust next, i love the sound of my LM but when i get headers id rather have a chambered exhaust.

FORCE_FED_Z 02-15-2006 10:23 PM

It does sound like a little much..

Why not just try and fix the one you have now? You can get a flex pipe from Summit that will allow a little flex. That and be sure that all your mounts for the exhaust are intact. It will be a lot cheaper than the close to $900 for your custom exhaust...

mxracerbrian 02-16-2006 01:16 AM


Originally Posted by FORCE_FED_Z
It does sound like a little much..

Why not just try and fix the one you have now? You can get a flex pipe from Summit that will allow a little flex. That and be sure that all your mounts for the exhaust are intact. It will be a lot cheaper than the close to $900 for your custom exhaust...


flexpipe?? that stuff is pretty bad!! it rusts like the moment you look at it :lolsign:

Drake 02-16-2006 01:56 AM


Originally Posted by FORCE_FED_Z
It does sound like a little much..

Why not just try and fix the one you have now? You can get a flex pipe from Summit that will allow a little flex. That and be sure that all your mounts for the exhaust are intact. It will be a lot cheaper than the close to $900 for your custom exhaust...

Well, I've been meaning to upgrade my exhaust anyway. I have grown tired of the Flowmaster muffler. The TDs should be a little deeper & louder I hope.

Those TD setups for sale on eBay are insanely cheap......I wonder what kind of quality they are. I still just don't like the idea of dumping it before the axle for some reason though.

I'm going to head back to San Antonio this coming Monday to see what they can do. Hopefully they can explain to me why they want to charge so much.....

FORCE_FED_Z 02-16-2006 08:38 AM


Originally Posted by mxracerbrian
flexpipe?? that stuff is pretty bad!! it rusts like the moment you look at it :lolsign:

I think you are thinkin of something else..:rolleyes:

The piece I am referring too is a braided steel type, not that crap from Autozone..

And Drake- I don't blame you for wanting to get rid of the slushmaster...I would too!!

mxracerbrian 02-16-2006 02:14 PM


Originally Posted by FORCE_FED_Z
I think you are thinkin of something else..:rolleyes:

The piece I am referring too is a braided steel type, not that crap from Autozone..

And Drake- I don't blame you for wanting to get rid of the slushmaster...I would too!!


Yup you are correct! thats exactly what i was thinking of. haha, my bad

archemedes 02-16-2006 02:18 PM

most new cars have flexpipe from the factory now

aarontracy 02-16-2006 02:32 PM


Originally Posted by Jpack
And you wondered how i always get exhausts for cheap. I am the king of bargin shopping....lol. Any part....... anywhere, I will find the best price. :lolsign:

then find me a true dual setup for my lt1 w/pacesetter longtubes!! :D i want to dump it before the axel.

Jpack 02-16-2006 03:15 PM


Originally Posted by aarontracy
then find me a true dual setup for my lt1 w/pacesetter longtubes!! :D i want to dump it before the axel.

Texas speed an performance offers them. It says on the website for ls1 cars however in the 93-97 section. Contact them for info. I have heard of many people running this set up from them. Pacesett lt's and their true duals. Email them, they will get back to you.

http://www.texas-speed.com/shop/cate...MID=2&catid=56

I have also heard of many lt1 guys using the 90 dollar kit from summit and then just getting longer pipes from the collectors back.
Summits site is down right now or i would give you the link.

aarontracy 02-17-2006 01:48 AM

ya 90 dollar kit sounds more my style :D

69z-28 02-17-2006 08:28 AM

true duals are over rated and a y pipe will work just as well. just my oppinion.

archemedes 02-17-2006 12:15 PM


Originally Posted by 69z-28
true duals are over rated and a y pipe will work just as well. just my oppinion.

if proper size a single exhaust has made more power on dynos.

Mike Jones 02-17-2006 03:51 PM


Originally Posted by 69z-28
true duals are over rated and a y pipe will work just as well. just my oppinion.

THANK YOU!! I'm so sick and tired of people going on and on about true duals while a good single exhaust can flow just as well if not better.

archemedes 02-17-2006 04:37 PM

didn't one of the magazines do an article on that not that long ago?

blue89vert 02-17-2006 04:49 PM


Originally Posted by archemedes
didn't one of the magazines do an article on that not that long ago?

If so i want to see it, prove everybody wrong about single exhaust

imported_Sincere 02-22-2006 10:07 AM


Originally Posted by 69z-28
true duals are over rated and a y pipe will work just as well. just my oppinion.


Please tell me you are kidding. Your opinion is wrong.


EDIT: After re-reading your post, I realize that I initially read it wrong...For some reason I could have sworn the word stock, was before y-pipe. Sorry for any confusion. :-)

69z-28 02-22-2006 01:05 PM

its cool, i didnt see the post till you edited it. just to elaborate, good headers, 3" or so y pipe and w/e after that will flow pretty much as well as true duals and be WAY easier. thats where you get the biggest benifit with a single pipe setup is the conveinence on a late model 4th gen. if you have an older car tho true duals all the way!lol

imported_Sincere 02-22-2006 09:43 PM


Originally Posted by 69z-28
its cool, i didnt see the post till you edited it. just to elaborate, good headers, 3" or so y pipe and w/e after that will flow pretty much as well as true duals and be WAY easier. thats where you get the biggest benifit with a single pipe setup is the conveinence on a late model 4th gen. if you have an older car tho true duals all the way!lol


I am gonna disagree with you on convinence though. I order a set of true duals from Texas Speed, and they literally slid right together and clamped perfectly. No problems whatsoever. The headers, though..That's a different story.

69z-28 02-22-2006 10:39 PM

alright well they are pre made true duals that have prolly been tested many times before put into production. go to an exhaust shop and tell them you want true duals is another story for sure!

blue89vert 02-23-2006 06:59 PM


Originally Posted by 69z-28
alright well they are pre made true duals that have prolly been tested many times before put into production. go to an exhaust shop and tell them you want true duals is another story for sure!

that totally made sense

Jpack 02-23-2006 08:06 PM


Originally Posted by ProjectCamaro
THANK YOU!! I'm so sick and tired of people going on and on about true duals while a good single exhaust can flow just as well if not better.

Well use this formula when deciding if the statements are true or false. This is a simple formula, You need 2.2 cfm per hp at the wheel. Then when you figure out how much cfm flow you need, decide on what size pipe you need. a straight pipe will flow 115 cfm per square inch. To figure sq. inch on a circle, the formula is (Radius squared X pie(3.14) = square inches). Based on that you can choose the diameter of the pipe. then choose a muffler that will flow enough for your needs.

Example using a 3inch pipe. R=1.5 Rsq.= 2.25 X pie = 7.07 X 115cfm = 800cfm. So 800cfm / 2.2 = 363 hp at the crank without loss from backpressure. Also take into consideration that the pipe under your car is not straight, so you will lose some flow with that also. You also don't want to big of exhaust, this will rob horsepower due to poor scavenging.(This is an airflow characteristic describing how air is moving through a pipe to an exit point. Heated exhaust gasses actually improve due to some back pressure. Actual amount is`hard to say unless you have a dyno to compare.)


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