How much money will I spend...

[ryanfx]

If I buy cats, two mufflers, and tips, and go to an exhaust shop and get a custom dual exhaust over the axles out the back. I'm talking about purely the work at the shop not the previous parts mentioned. Also, will this give me the sound quality of a dumped true dual system? Should I buy a true dual system and just have them extend it?

[Savage_Messiah]

why the F would you want cats

o and also the single can flow as well as you'll ever need... true duals are for bragging rights or if you really want that sound

[Squirrel]

ry, i will disown you if you buy cats....you can buy a T/D setup that connects to LT's and ****, i think texas speed sells it

[ryanfx]

lol you're serious about me not getting these cats!!!

The only problem with that kit is I think TA's look FUGLY with no tips going out the back. Camaro's can pull it off because they dont have a spot for em anyways.

I'm just afraid of toying with the law too much, not really feeling getting a DI%K cop one night and get my car towed.

[Frosty]

It's not going to be cheap. Over the axle take a lot of time and fabbing to get it done. I'd be shocked if you got out of there for less than $700. It also depends on the materials you use.

Also, I don't understand why everyone is flipping out about someone running cats. A good set of high flow cats might rob 7-10hp...which really isn't that much. Plus they can help keep things on the quieter side of things really get out of hand iwth the loudness.

[WayFast84]

i want true duals with cats, its not like i would ever pass with out cats..

you dont need cats cause u can delete the code

I gotta go on a dyno

get fake cats and u wont get ur car towed

[bad64chevelle]

or do what I will be doing on the Nova. LTs directly to two bullets then two electric cutouts so the exhaust is dumped under the car when I want, but then over the axle to the quietest muffler I can find, and quiet the car down ALOT. Pull up at the light next to the unsuspecting car and just before the light goes green open up the exhaust :-)

[WayFast84]

ive been toying with a true dual exhuast to, but I dont have the money plus I dont have long tubes.

[JL8Jeff]

True duals aren't really needed until you're making some serious power. It won't be cheap to go all the way out the back but dumps sounds like **** so don't even bother. Are you looking to make more power with duals or just want to say you have duals? Because I have a Dynomax Ultraflo crossflow muffler for sale that flows 1200+ cfm which will support 600+ hp easily.

[BlackBADaSS02]

I plan on doing a true dual system over the axle very shortly. I'm going to start getting quotes probably within the next two weeks.

[79CamaroDiva]

i didnt think exhaust shops would touch a car without cats? i know the meineke by me wouldn't. but they put high flow cats on for me anyhow, and when i did eventually hollow them out there wasn't a noticeable difference.

i'm not sure this will give you a general idea or not, but on my 79, I had them put on the high flow cats, and run full true dual over the axle and out the back and it cost around $400 a few years ago.

[JL8Jeff]

Here's a true dual exhaust done with chambered pipes from www.sweet-thunder.com but it doesn't have cats. I think this setup cost around $700. You could probably get the cats like Ron has on his 35th anniv car added into this type of setup.

http://www.sweet-thunder.com/images/testimonials/13.jpg

[foff667]

I've seen over axle setups go for as little as $500 but not mandrel bent...you get what you pay for in the end...I would say $800-$1300 for a decent setup not including mufflers/tips/cats. Not really worth it IMO.

[ryanfx]

so if you guys say all of this isn't worth it, If I want to run cats, what exhaust method (y pipe, duals) etc into what catback or exhaust will give me the deepest/meanest tone. I always hear people rave about their true dual dumps.



@JL8Jeff: Thanks for that picture.. made me understand why these setups are expensive! :shock:

[Squirrel]

i think you already have one of the best setups out there, you cant get much more unrestricted or free-flowing with an open borla...but you gotta remember, its an ls1, it'll never sound that good:grin:

[foff667]

Here's a true dual exhaust done with chambered pipes from www.sweet-thunder.com but it doesn't have cats. I think this setup cost around $700. You could probably get the cats like Ron has on his 35th anniv car added into this type of setup.

http://www.sweet-thunder.com/images/testimonials/13.jpg

If you read the testimonial he bought the mufflers through them & had a muffler shop fab up something.

[12secondv6]

Do you really need true duals?

It isn't cheap.... labor will be up there.

Get cats - catco's for $42 each.

Why are you changing it? Just sound? Just for a couple extra HP? With the added weight and cost it probably isn't worth it IMHO

[wrong generation]

i have true duals on my 86 transam that i did my self only cost me $300 and looks like it came that way from the factory

[BonzoHansen]

i have true duals on my 86 transam that i did my self only cost me $300 and looks like it came that way from the factory
Over axle? Pics?

[ar0ck]

True Duel is a waste unless your making big numbers.

Go with a single exhaust, its a great weight reduction! If your just looking for the sound just get a cut-out in there. IMO unless you have a big lopey cam true duels sound horrible on stock F-Bodies,

[ryanfx]

I'm going with the duals purely for sound quality. Borla is really raspy around the 2300 range and I want a change. So I basically need to decide if im going with duals under the axle now or buy a used catted y pipe and what im doing with my catback.

[ATVracer]

I have true duals with dumps and everyone always says it sounds good.
Quieter than most cat backs.

Car just made 700hp on a mustang dyno thru the exhaust.
No cats.

[ryanfx]

ok so to sum everything up, would true duals be worth the difference in money (running out back, under the axle) rather than a y pipe + catback?

EDIT: thank you eric =D

[Squirrel]

ry...dont type when youre drunk...you = horrible drunk typer
eb = good drunk typer....see? :)

[2001orangess]

wtf are cats??

[JL8Jeff]

Whoa, you want to run the pipes under the axle? No way I would do that. Save your money for other mods and just stick with a decent cat-back. Change the muffler if you need to.

[Frosty]

Whoa, you want to run the pipes under the axle?

Why not? A LOT of people are running it that way and they're not having problems.

[BigAls87Z28]

Under the axle?

[Frosty]

Yes.

There really aren't many clearance issues as odd as it may seem.

[ryanfx]

If you think about it, under the axle is the absolute best place to loose ground clearance. If you go over a speed bump, naturally your wheels will hit it, which will obviously be right by the axle and raise the pipes =p

[BigAls87Z28]

Uh...if I recall, the back end of a car has suspension, and it compresses when you go over bumps. If you go over a speed bump, the rear will compress, bringing the ground MUCH closer to the exhaust. I want to see a picture of it. There is a reason why every car maker in the world as well as every aftermarket manufacture of exhausts have it going over the axle. And what happens when the car lifts and the suspension extends all the way out? Wont it push down on the exhaust?
Way way way too much talk about something as simple as an exhaust system. If you are worried about flow, Im sure that a nice 4 inch system from Mufflex would work just enough. anything more, its a race car and who gives a eff about exhaust.

[project89]

Uh...if I recall, the back end of a car has suspension, and it compresses when you go over bumps. If you go over a speed bump, the rear will compress, bringing the ground MUCH closer to the exhaust. I want to see a picture of it. There is a reason why every car maker in the world as well as every aftermarket manufacture of exhausts have it going over the axle. And what happens when the car lifts and the suspension extends all the way out? Wont it push down on the exhaust?
Way way way too much talk about something as simple as an exhaust system. If you are worried about flow, Im sure that a nice 4 inch system from Mufflex would work just enough. anything more, its a race car and who gives a eff about exhaust.
u only lose ground clearnce if u run over something in the middle of the road,if u go over a speed bump the pipes will go up with the rear axle,my turbo inlet and down pipe run under my front crossmember and i have never bottemed them out on anything,and we have some pretty ****** roads around here,when i go over speedbumps/etc the pipes go up with the car since they are pretty much on the centerline of the tiires

[BigAls87Z28]

Ok...Ill have to take your guys word for it. I scrape some roads in the Bronco, I dunno how the hell guys manage not to scrape in a thirdgen or 4th gen no less.

[Frosty]

http://ls1tech.com/forums/showthread.php?t=533493&page=1&pp=20

Here's one thread of many discussing this very subject.

[Savage_Messiah]

ok so to sum everything up, would true duals be worth the difference in money (running out back, under the axle) rather than a y pipe + catback?

EDIT: thank you eric =D

IMO no

[JL8Jeff]

No way I would run pipes under the axle. With the crooked speed bumps at work and the uneven curbs going into parking lots they would get hit gauranteed. If it's a race only car then who cares but a driver will end up hitting something and doing damage.

[NJSPEEDER]

would true duals be worth the difference in money (running out back, under the axle) rather than a y pipe + catback?

EDIT: thank you eric =D

simply put, no. large single set ups have shown jsut as much power as duals without all the hassle and expense of fitting under teh car. 3rd and 4th gens have plenty of space for up to a 4inch single with a good y-pipe.
mufflex makes mail order kits or you can jsut go to their shop in hamilton and have the whole ypipe and cat back built right in the car so it is perefect.

[ryanfx]

simply put, no. large single set ups have shown jsut as much power as duals without all the hassle and expense of fitting under teh car. 3rd and 4th gens have plenty of space for up to a 4inch single with a good y-pipe.
mufflex makes mail order kits or you can jsut go to their shop in hamilton and have the whole ypipe and cat back built right in the car so it is perefect.

but I think you guys are still missing the reason of why i'm switching. I stated before its purely for sound. I could give two hoots if I pick up 5 HP. Is it worth it for the increased sound quality!!

:hammer: :lol:

[JL8Jeff]

but I think you guys are still missing the reason of why i'm switching. I stated before its purely for sound. I could give two hoots if I pick up 5 HP. Is it worth it for the increased sound quality!!

:hammer: :lol:

No way.

[ar0ck]

even if its purely for sound its a crap idea. On a stock motor true duels sound like total ass. go to www.ls1sounds.com and look for clips of stock internal motors, your not going to like it. If you have a huge cam then maybe.

And as far as a single being too "raspy" for your car you might as well buy another F-body because that is just the way the LS1 is.

[Frosty]

It's not the fact that "true duals" sound like ****...I guess it's opinion but I think a lot of the setups sound great even on stock motors...its all about the choice in mufflers.