They said that the muffler outflowed their competition but all manufacturers say that. I think it will flow plenty for my 360-400 rwhp that I'm shooting for. Is there any reason that you don't think the magnaflow dual in dual out is good?

Thanks,

Scott

 

http://home.koping.net/u3243a/avgassystem.htm pics
http://home.koping.net/u3243a/Tomgang.wmv movie clip
It supported 570rwhp
Have replaced everything after the rear axel, Now its only a small straight true muffler at the right side. saved me 30 pounds... Gains? hard to say,reved up the p1sc at the same time and got a slipping belt at the same time (sea clip from dyno)
http://home.koping.net/u3243a/Tavling2004/broms.wmv 9mb

Have saved the first (quiter) setup, only 20min work to swap...

"mingame"
"Not trying to discourage you from building one. Hey sometimes it's just fun to build things.
But you would likely find better performance from a well engineered design."

Thats true, we made my system at http://www.ferrita.com/show.asp?textid=2 (northen europs biggest vendor of stainless and custom exhaust systems) my friend works there

 

Well I've been searching through muffler catalogs and websites and I found that magnaflow makes a 4" round 2.5" in/out muffler. Two of these would prob. flow better than the 2.5" dual in dual out muffler like mindgame uses correct? I'm thinking dual 3" with an x pipe then a 8" transition to 2.5" right before the rear axle then up and over the rear and put the muffler where the tailpipes usually are. Then put a small(in length) tailpipe on the end. How many inches of tailpipe are you supposed to have off a muffler? I thought i read 8-12" somewhere for the best horsepower gain.

 

Dont know if they flow better but it should reduce the number of 90degrees bends so theoretical it should flow better. About lengdh of "tail" pipes, dont think it matter so much, was more a question of avalible space for the muffler that gave the lenght when we modified our exhaust....
If i remember correct we mad the muffler 16" that was max what we could fit widhout have to use to "sharp" bends...
Should see if i can take a pic of it later...

 

Sounds good. The magnaflow is 14" long and stainless steel and there only 55 dollars a piece from northern auto parts I was going to mount two 6" round mufflers where the stock one was but that would be a mess and I would have to worry about ground clearance. I doubt i would ever have the money or the desire to approach the numbers that you guys are putting down... Well at least with my Trans Am. I figure it this way. GMMG is putting there 3" single exhaust systems with two chambered(doesn't flow as good as the magnaflow) mufflers on there 630 hp cars. Using there logic this system is overkill for what I'm doing.

 

For power you really don't need much tailpipe behind the muffler. Just a turn out or turn down would be fine. Tailpipe length does relate to noise. In that case, more is probably quieter, but you risk restriction if it has bends.

I agree that the two 2.5 ID 4 in round Magnaflows or Ultraflows would flow like crazy, but they might be noiser than 4 x 9 ovals with the same ID pipe thru them because there is more volume to tune or attenuate the sound in the oval. Of course packaging is the problem, but hey, there's never a free lunch.

FWIW, I like the "closed organ pipe" technique of exhaust tuning instead of conventional mufflers. CORSA uses the principle internally in their mufflers, but it can be done by adding "tuning" tubes of various lengths along the exhaust system with virtually no flow restriction. There has been a thread or two where this was discussed in the past. If I were designing my own exhaust system I'd try it.

There is a regular contributor to this forum (who's screen name I can't remember...don't get old, memory is the second thing to go...) who works for an OEM exhaust component manufacturer. He's VERY knowledgable about this stuff. I'd listen to him if he posted.

My $.02

 

http://home.koping.net/u3243a/tillfalliga/dsc01941.jpg
http://home.koping.net/u3243a/tillfalliga/dsc01942.jpg

It is 6 inch diameter, and if you look at the inlet it is a bend just infront of the muffler, thats something you dont want, therefore we have a solid pipe the first 2" inside the muffler to "straighten" out the exhaust gas You dont want turbulence in the muffler...

 

Is that whistling the belt slip or is that part of the exhuast note in those videos?

Btw i love your car.

I just noticed now that you mounted a 6" muffler in the same place I was planning on mounting the 4" muffler. So there is enough room there? How is ground clearance? Also do you have clearance on all sides of the muffler?

Thanks,

Scott

 

Thanks
The whisting is the superhager..... I cant here anything when the belt is slipping...

Jepp its plenty room for a 4" muffler, i estimate it to be 0.7-0.8 on each side widh a 6" and ground clearense is GOOD, doesnt have any better pics than this
http://home.koping.net/u3243a/tillfalliga/pict0205.jpg
http://home.koping.net/u3243a/tillfalliga/pict0215.jpg
The best thing widh the side monted muffler is that i dont need ramps under the rear wheels when i should put the jack under the rearaxel, the other muffler was so big that couldnt get the jack in from the rear

 

Hmm now i have a dilemma on hand. Should i go with the dual 6" 3" in/out rounds or with dual 4" 2.5" in/out rounds. If i can get the pipe for free it should be the same price since I would have to buy reducers which I'm guessing would be around $50 for stainless 8" reducers. I'm pretty sure the magnaflow 6" round is 14" long. Do you think the 3" setup would be quiter than the 2.5" setup since there is more packing volume in the 6" muffler than the 4"?

 

BTW thanks for the pics/movies!

 

I should go for 2 x 2.5" belive that it should be youre quitest option (its harder to reduce soundlevel in a bigger exhaust pipe) less weight, and not more restrictive than the 2x3" setup in your case... maby less restrictive since you whant to keep up the speed on the exhaust gas (less speed=colder=higher density=restriction)...

Also, dont let the tips finish under the car if you dont like rumbeling and enojing tones when you drive at the higway.... Its a Looks vs function you have to balance....

Good luck

 

I have a set of corsa premium tips so those will go on. Thanks for the best wishes i'll need them. Now i have to talk to my source for the stainless pipe. Does anybody know where i can get a 3" to 2.5" reducer in a 8" length.

 

Well they do not have exactly what you are looking for but if you guys need larger size mandrel bends or pipes this place has a decent amount of selection.

I made my intercooler piping from their supplies. Quick service too.
http://shop.airflowonline.com/Merchant2/merchant.mv

 

Thanks for the link. They are kind of pricy though to bad they don't offer stainless pipe.