3" True dual. Good or bad idea?

I have an 89 C1500 with a 305 and an Edelbrock intake manifold (thats about it :rolleyes: ) Right now I have single 2 1/2" diameter tubing with no cat and a magnaflow muffler. I HATE it, sounds like whinypuffychickencloudyairhead...Thats the only way i can describe it. I am looking into getting some 3" diameter piping and making my own true dual kinda system. Im just wondering how it would sound with only a 3" dual inlet/outlet flowmaster somewhere on it (dunno what series yet) with an H pipe after it into dual 3" slant cut tips straight back. Any suggestions would be awesome, planning on getting the tubing sometime next week so sooner the better. :icon16:

very good idea. but do you mean true dual as in two completley different pipes and mufflers that only connect at the H? that is the best way to go for better exhuast flow and sound. i have true dual flowmasters on mine..with the converters. 3" pipe should definatly get you a deeper tone and i would recomend the origional 40 series, they are slightly louder than the delta flow. and i would consider getting high flow converters because sometimes too loud just doesnt sound good at all. the mufflers should only be about $70 each.

yeah I meant two totally different 3" pipes from manifolds back that bent towards eachother halfway through to go into a flowmaster that has the dual inlet/outlet, then just continuing the pipes seperate after the muff. A little ways after the muffler im thinking an H pipe to equalize it, but I don't know what diameter to use for it. The pipes would start bending away from eachother right after the muffler going to straight back 3" slant tips. So it would be true dual, but both pipes would go through the same muffler. Would it sound bad without cats? I want loud and crackly but not burn your ears loud. Only $70 for a dual 3" inlet/outlet 40 series? Where would I find that? haha. Also do you know where I could get the 3" diameter stainless steel tubing for it? I don't know how long I would need em yet, but i'll measure tomorrow and i'll draw a picture of what im thinking of after my computer stops being ghey.

Here's my diagram haha. Im no artist but I think you can see what im thinking of. How loud, how good, blah blah blah, would it sound? I only have like 4 days before the last day I can get the tubing cheap, any suggestions would be great asap.
http://files.automotiveforums.com/gallery/watermark.php?file=/502/215914Truck_Exhaust_Concept.jpg

EDIT: damn, sorry my bad. I just looked and it's a Flo-Pro muffler thats on it right now haha. It was the only one I could afford at the time and I just mixed up the names. Plz someone gimme some suggestions or better ideas or fix it up or something soon I need to know asap so I can get the discounted tubing through my metals class.

looks good to me. I do know that having both exhaust pipes going through one muffler will quiet it down a bit as opposed to one muff for each pipe. it will be more of an even tone instead of a loapy back and forth tone (like when you put in a big cam). I might be wrong here also but I think the H pipe is suposed to go before the muffler. But then also you might not need the H pipe since your esentially doing the same thing by bringing them both into the same muffler.

I just installed a Flowmaster 50 series single inlet duel outlet on my truck. I have stock manifolds, duel cats, Y pipe into a single pipe into the muffler then duels out of the muffler to the bumper. It's not as deap as I was expecting but it still has a bit of the flowmaster sound at the tips and the anoying resonance in the cab is gone ( I dont go deaf driving down the highway now).

Hope this helped at least a little. I'd say go ahead and get the pipe since your getting a deal on it then you can work out the little details.

ok cool thanks.

With two mufflers and no cats it would most likely be out of control loud. i would say either add high flow cats or just get a single muffler. i got mine from a small a small auto shop..dont go to napa or auto zone or somewhere like that.

So a single dual inlet/outlet 40 series wouldn't be balls on the walls loud? Like that pic i drew? I only thought of that design kinda thing cuz im cheap and dont want to buy two haha. I dont have emissions so i dont need cats, but dont want crazy loud, just controlable anger loud. :evillol:

I dont belive it would be loud. Should be good to go.

alright cool. ill take the measurements tomorrow and order the tubing and get the muff. sometime next week. Thanks for your inputs.

Remember, I'd check on the position of the H pipe (before or after the muff) or if it will even be needed with a dual in/out muff.

I looked around a little and found this LINK (http://www.hotrodders.com/t43951.html) that suggests an x pipe over an H. Also I found THIS (http://www.ls1.com/link_exhaust.html) that has a really cheap looking crossover deal I could maybe do, but I don't know if the dual inlet/outlet muffler would have the same effect as an H or X. Also I looked around and I saw some H and X pipes before and after mufflers so im guessing it doesn't matter...? I don't need cats because theres no testing here, and im just looking for the cheepest way to do this. should i just suck it up and buy a second muff and an X pipe or will my one muff. idea be about the same and so on? Damn so many options haha.

EDIT: What size diameter and how long should the H or X pipe be? Im thinking X because in the one link it was favored. Also the H and X pipe don't need cats in them right? Like would an X pipe that is just some tubing work or anything? I could just order the tubing im ganna get longer and cut it a bit and stuff...gahhhh what should i do!? :lol2: I'll post another drawing of something im considering once I eat some of this birthday cake... :naughty:

EDIT #2!: I just found this LINK (http://shop.store.yahoo.com/rodi/flfoiiexki.html) That says it should be same diameter as the system and as close to the manifolds as possible. Im sorry for such a long post but I am pretty set on doing this but I would like suggestions first. And im a loner so heres the only place :p Thanks in advance for reading this shizzaz haha.

Alright heres another link I found. LINK (http://www.digitalnoesis.com/trucktech/exhaust.shtml) Would 3" piping be too big? All I have is a 305 with 280,000 miles about on it, but has been well maintained...haha. I would like performance gains, but this will be more of a 80% caring about sound, and 20% me caring about performance. I don't want to hurt it (it's already slow enough) I just want the sound mostly. Heres some more terrible pictures of some things that are probably more expensive than my first idea, but I want something that works good. Thanks for putting up with my awesome artisticness. :grinno:
http://files.automotiveforums.com/gallery/watermark.php?file=/503/215914Truck_Exhaust_Concept_2.jpg
http://files.automotiveforums.com/gallery/watermark.php?file=/503/215914Truck_Exhaust_Concept_3.jpg
http://files.automotiveforums.com/gallery/watermark.php?file=/503/215914Truck_Exhaust_Concept_4.jpg

Maybe a mix of a few of these? Im so clueless, I have no idea what I want...im starting to feel female... :lol2:

I can do all the bending and welding myself in my metals class, but would bending 45 degrees or whatever be too much and crunch it up making it not work as good, or sound as good? Would doing curvy slight bends be better because it wouldn't crump up? I think im going crazy... :screwy:

3 inch is really to big for true dual exhaust. With other F Body vechiles Ive used 2/1/2 and 2/1/4. Imade a set for my 76 Gmc van 350 out of 2/1/2 which works good. Crossover is a good way to go. It takes a lot of bending if you have access to abender. I didnt so ihad to do alot of welding. If you have the time you can save money instead of buying a set all ready made up. On my 90 1500 I went with Summit Headers and a single 3 inch exhaust which works very good. Hope this helps and good luck!

So 2 1/2 with an X pipe before the muffs would be best? Im thinking I might as well make it true dual with two different Flowmaster 40 series and the X pipe as close to the headers as I can make it. It has a 305 in it now, but im planning a 350 sometime within this year. Do you think I could get away with it and not get pulled over all the time, or would it be close enough to not illegal to where I could get away with it? Also do the muffls have to be at the same spot as the other one making it symetrical? Thanks for the suggestions. Is there anything else i should know about or tips? haha thanks.

Just take it to an exhaust shop and tell them what your ideas are. They can figure out the rest :) That's what they get paid for.

I would go with 2/1/2. They will probally be loud exp if you are running a cam. Ihad a 75 Firebird 350 with a Performer cam and Headers with no cats. It was really loud exp from 800 to 2500 rpms. I wasnt running flowmasters just header mufflers and cherrys to Quiet it. Yoou might want to go with performance cats if it is too loud. Cops love Loud Vechiles!!

lol. I learned how much they love them. I got a $173 ticket when I only had a cat and a burned out glasspack.

So 2 1/2" and I just call em up and tell them what the model and blah blah and so on, and they will/should be able to make it without even bringing in a paper mache mock setup exhaust thing or the truck? I have a gutted cat on it right now and theres a sign that says it's a $2,500 fine if they catch you, and I rather not risk it haha. :tongue:

I heard that the piping and bending would be around $300, but i didn't hear how much the Flowmaster 40 series muffs would be included with that or if they even were. I dont have emissions up here in MN so I rather not have cats if I dont need them. I can do the welding and putting it on myself if that helps. Anything else I should know or helpful info on this would be great. Thanks for the suggestions. :iceslolan