OK i'm sure this is something many people have an opinion on so here it goes.

this custom exhaust place in pittsburgh kicks *** (they do a lot of the Hollywood knights cars in pittsburgh, if u've ever heard of them www.hwknights.com ), they can put true dual stainless steel exhaust on, it includes thorly (sp) headers, 2 high flow cats and 2 high flow mufflers. or i can buy the thorly (sp) headers, with a good y-pipe and custom cat-back system or buy a cat-back (soo many to choose from) and i know that true dual don't really benefit u unless u have over 350-400 hp or have a big block, and i don't plan on going to that kind of power, and both setups cost about the same about a $1,000+. with true dual technically u r running 4 cylinders each pipe and the sound from both come out the back, so would a H-pipe be something to get for true duals?

P.S. how can i get a good sound recording of my car and where would i place the mic?

 

no offense guys but from what I've been seeing this forum is all about bragging and what cat-back is better. i know i know... "search for true duals, it's a very popular topic" well i have and I'd have to say out of about 50 topics (with a search of "true duals") none of them talked about what is better, true duals or cat-back. and BELIEVE ME i found some great info on true duals and only true duals. all i put this this post up for was to see if anybody has had the "example" slp headers with high flow cats and hooker cat-back setup and a true dual setup to see what setup they like better and if one is louder than the other. that's it, that's all i wanted but i doubt I'll get that. but i got a lot of info from post made months ago so it wasn't a loss of anykind, hope to reply to or make posts that give poeple good info.

Thanks,
Chio

 

well ive been told that it is hard, not impossible though to fit 2 mufflers and 2 cats under a 3rd gen,, i am interested in going dual but where do the cats go and the mufflers? If anyone has some diagrams of this id like to see them.

 

I can't remember for the life of me who it was but in one of the threads I was reading some guy showed the diagram of his setup for true-dual. the way it ran is actually both piped ran along the passener side (almost like cutting the stock pipe in 2), having the cats one after the other so they weren't next to each other and could fit, then both of the mufflers were the same under the trunk. Instead of 1 pipe on either side of the car, both pipes came out the back left side. Thats all I can remember. If I remember who it was, I'll make sure to post it....

 

It was Willie. If you search by his name, you will find a ton of posts, and in his sig there's a link to his homepage. He has many pics of his system (true dual, dual cat's no ground clearance problems).

 

....all i put this this post up for was to see if anybody has had the "example" slp headers with high flow cats and hooker cat-back setup and a true dual setup to see what setup they like better and if one is louder than the other.

Well, my setup is close. It was:

1-3/4" SLP headers
Dual cats
Custom made 3" cat back with an 80-series Flowmaster
Chromed 1994 Z28 tips

Now, it's:

1-3/4" SLP headers
Dual cats
Custom 2-1/2" duals routed the same as stock (passenger side and over the axle)
Two polished 1969 Z28 chambered mufflers positioned in the stock muffler location
Chromed 1994 Z28 tips


Is my new setup better? If you mean sound, it's definitely louder. I can attribute this to the change in mufflers, not necessarily the change from a single 3-inch to a pair of 2-1/2 inch pipes. If you mean performance, I don't know as I've never run the car at the track with the true duals. Even when I eventually do, it won't be a realistic comparison from my previous track times because I've changed a number of other things.

 

I believe true true dual helps out a lot, but like someone said only when your are running about 350+ HP. I has the true dual setup on my camaro and let me tell you it sounds like a monster! From each header (or collector) i am running stainless steel piping underneath both sides of the car with the tips sticking out of the side of the car (right behind both doors or infront of the tires) it looks really sweet and sounds nice also. Im running true dual exhaust with no cats and on each side i have a 1 chamber muffler to give it that aggresive tone, and believe me it does! Anyways i took some pictures of it but i havent got the camera delveloped but when i do i will post it up and so you guys.

 

No, it wasn't Willie, whomever it was had a black camaro, but I must say, Willie, that is one AWESOME setup you got there. Gonna be sending you a pm, got a question or 2 to ask ya...

 

just something to remember....if this muffler shop uses press bends, even dual 3" pipes will flow worse than a single 3" mandrel-bent catback. if you doubt thats true, heres how i calculated it. dual 2.25" pipes = single 3" pipe. dynomax advertises that 30% of the diameter of the pipe is lost through their muffler bend. obviously that % will vary, but i doubt it would be any less than that. anyway 30% of 3" is approximately 2" or 2.1" to be exact. so, it is like running dual 2" vs single 3". and since 2" is less than 2.25", it will flow worse running press-bent dual 3" than it would a mandrel-bent single 3" assuming you have a quality y-pipe. so what im saying is....use mandrel bends

 

I should have included this sooner. Here's a audio/video clip:

http://www.iroc-zpostforum.com/MemberWillie.htm

Willie

 

it was probley me i had the dual exhaust on my car but just changed to a 4" heres a new pic forget about the date i just took it today but you can still see my old setup at .

http://darcom.org

 

YEP!! It was DARCOM alright!!....

Question, I was thinking about doing dual pipes too, but I wanted to do side exiting...would that be a lot easier and a lot less bends? Or would it be just as difficult as pushing them out the back?

 

That depends on if you want ground clearance. If you go out the side, you probably wont have much. I only have one bend in each side of my exhaust which are hedman s extensions, but I have long tubes. I have about 5" clearance and dont srape on anything(had the clamps drag on my friends driveway before I had it welded so its close though. I have turndowns at the rear. I would like to continue out the back, but There is no one locally that does mandrel bends so it will be a while. Also if you plan to fit mufflers and or cats I would consider stock routing like willie's or something. I have bullet mufflers and they fit fine, but they are small.

Ben

 

DARCOM - is that a mufflex 4in. flowmaster kit or is it custom? Does it sound or perform any better than your old duel setup?

Mike

 

well i just got it , it was a custom job had to work around the spohn stuff. it feels the same to me but the resions i changed it
was 1. the new spohn stuff i got did not clear it 2. theres a weight
differance between having two pipes and two mufflers 3. this exhaust does not get as hot neer the fuel tank causing my tank to purge from the excess heat 4 the pipes were getting old and had a few dents from speed bumps and stuff.
oh and its sounds alot better and louder.
heres a new pic of my y pipe

 

is there anyone on here who hasnt had to modify their undercarriage and install spiffy new parts? Wonderin if anyone has a decent dual setup without moddin anyhting. I mean i dont wanna notch my frame or buy new linkage and stuff?

 

I do and I didnt have to modify anything. I may end up haveing to do some modifications in the future if I get an aftermarket crossmember and torque arm though. I have about 5" clearance. I dont really hit on anything.

Ben

 

can that setup wprk for shortties as well?

 

I suppose it could. You would have to fabricate a pipe to run down from the header and turn toward the back of the car on each side. After that I ran it straight back down the driveshaft tunnel on each side, but I have turndowns at the rear end.

Ben

 

2

 

hey 2 dope, check out *******,

http://members.optushome.com.au/iroc.../willies87.htm

 

darcom where did you buy that torque arm and cross member or tranny mount.

 

i got it all from spohn, cool huh.

 

yeah it makes it look more like a real race car not no fake crap how much was it.:hail: :hail: :hail:

 

Check his page. He is a sponsor at the top.

Ben

 

just looked at spohn's web site man i love those sub frame connectors they must be the best ever!!!!!!:hail: :hail: :hail: :hail: :hail: :hail: :hail: :hail:

 

DARCOM, that setup is sweet, I think I know what my new exhaust system is going to look like now

Scott

 

Well Scott, you need a motor in the car before you would require an exhaust system!

Just messin' with ya!

 

Darcom- what muffler are you running there? Whatever it is, it looks like a good setup to scare the old ladies and children. :lala:

 

yea its loud its a 4 inch flowmaster delta flow 40

 

Yeah, it looked like a flow, just didn't know which one. Cool

 

Darcom - how much did it cost to notch your sub-frame and do the rest of the exhaust? Do you have any pics of the C - notches without the exhaust in the way?

Thanks,

Mike (1bad91Z)

 

i had all the work done for $700. .
3 inch y pipe and 4 pipe cut and cut and welded from scratch
notch the sub frame and welded support.
plus muffler for $110. i thank from summit

the only reason i notched the frame was becouse i did not want to modify the spohn trans bracket even though i had to, to run pipe under the safty loop.

 

here is a pic but sorry none with out the pipe