I have true dual exhaust and 2 small mufflers now. I am looking at getting bigger pipes from the headers and two 50 series Flowmasters. Will 2 of these mufflers fit under the car?

 

I tried that...ripped the driver's side muffler off on a manhole cover. I ended up going with oval tube exhaust and mufflers.

 

What mufflers did you use? Would one big *** flowmaster muffler put in the location of the old stock one flow enough for my set up? It is a radical cam, but I am not sure of the lift numbers.

 

If you are putting true duels on your car the spintech mufflers are not as tall as a Flowmaster and still give great performance. Plus if you have an exhaust man who knows what to do you should be able to run the duels down the same path as the single exhaust and stagger the mufflers for clearance

 

Cool. I had never heard of Spintech. Thanks.

 

Spintech also sells "flat" pipe like what you would see on a NASCAR or an number of other stock car racing. However the flat pipe is not cheap but it does give you more clearance. reseach Spintech and see what you can find

 

Hi
I was planing to do the same like you. I am working with a twin turbo setup on a 383. and need some free flow on the exhaust. My plan is to use 2,5 in tubes from turbo's al the way, with some "slim" mufler" behind axle, ore bether with a X-over. But some inputs on how you route the tubes under your car would be nice.
Do you have any pictures from your routing?
Did you build this your self or do someone build this for sale?

Thank you for time!
Artic Trans Am

 

I'll take a picture and post it tonight or tomorrow.

 

An exhaust guy suggested to go with one 3" pipe into one Flowmaster with 2 outlets. He said it would flow just as good or better than two 2.5" pipes to 2 mufflers. He said it is due to the narrowness of the bends in a 2.5" pipe.

Does this make sense?

 

NO it does not. Your exhaust guy needs his head examined. dual 2.5s will flow quite a bit more than one 3" pipe. And as far as mufflers go, a singe in single out is the most effecient. The transverse mounted single in dual out mufflers on our cars are not the most effecient. Dynomax's chart says you need either a single 3.5" pipe or dual 2.5s at the least. If you have more than 450 hp then you need a single 4" or dual 3" according to Dynomax. It all depends on how much power you are making. I see you have an AFR headed 383 so I am assuming you are making good power. If I were you I would run a single 4" exhaust from Mufflex, or run true dual 2.5s or dual 3s.

 

It didnt sound right to me. Thank you for that info.

 

ive heard a number of places that a 3" pipe will outflow 2 2.5 pipes, but if you do the math it doesn't hmmm...

 

This is kind of what I was expecting - that there would be conflicting info. I do appreciate your input. The exhaust guy I talked to has been doing it for about 25 years.

Also, the info from Dynomax was probably in general terms right? Maybe not taking into consideration the bends that would have to be made for duals on a 3rdgen?

I dont know the exact HP of my car, but I do know it pulls very, very hard all the way thru to redlne. I dont want any restrictions at all though and that is why I'm upgrading the exhaust.

 

if you have a mandrel bent 3 inch single pipe it WILL out flow duel 2.5 inch pipe that most any exhaust shop puts on because you will have so many bends in the duels. As you bend pipe the pipe looses its round shape ruining its flow propertys.And some places the pipe will even kink slightly if the radius of the bend is too tight. If you can find a shop that has a mandrel bender the duels would flow better but its gonna cost you more that most after market 3 inch bolt on's. Now....you can also buy prebent exhaust radius' from a lot of different places. If you have the time and equipment you can make your own by buying the proper bends and a lot of cutting and welding. But I am telling you to check out spinteck and thier "Flat" pipe it will solve any clearance problems you may have. but it isnt cheap. if your exhaust guy know what he is doing you can double stack the flat pipes right down the factory exhaust tunnel. And since the pipe is about 3 inch "flat" by 2 inch you can run the duels on top of each other back to the rear end. Remember.....if you dont do it right the first time.......your going to spend more money doing itr the second, third and fourth times.....work hard.....save money...do it right the first time!!!!

 

I have done some search around for a good dual flow, and this one is "cute", from my opinion.
I'll go for this one!
http://members.optushome.com.au/iroc...st/exhaust.htm

This is some nice work. I think it is "some" work, but if you have time I think this is loud and nice!
It is with cat's but no problem building with out that! And mighit use some other muflers.

And to companies that build exhaust systems -you just go and build- I am willing to pay for this, if someone did build it! (but I have to do it my self)

Still building!

 

You should be able to fit the two Flow Masters in the stock location. I'm running two Flo-Pro's with no issues. They are about the same size as the Flow Masters. Check out the link for a photo. You can find more photos in the sticky at the top of the page. Mine is on page 3.

https://www.thirdgen.org/forums/atta...e-mufflers.jpg

My pipes run under ther rear axle, not over. This daily driver has no clearance problems. (Stock ride height)

 

I recently installed a 3.5" mufflex catback with a single in and out spintech muffler. And the sound is awesome...at wot throttle its music. And gave a nice seat of pants power increase.

I have 2.5 pipes going into a single flowmaster 2.5 to 3.5 y-pipe. Then to the mufflex catback. It has very little back pressure on my 406. And ground clearance is just as good as the single 3" if you tuck it up there right.

 

those GMMG mufflers sound awesome!!!!

 

Thanks for confirming that they will fit there. I was wondering about the possibility of running pipes under the axle too - looks like yours are nice and snug up to the bottom of the car. I dont think my car would have any problems with clearance either as it is stock height also. It isnt a daily driver either - and...there are no speed bumps anywhere I will be driving. I am going to buy the necessary mandrel bent pipe from Racing Solutions >>> http://store.racing-solutions.org/bendkits.html. The exhaust guy said whatever I buy, he will put it on. I am going to show him a pic of yours. Thanks again.

 

Just so yo know, I'm running 2-1/2" pipes.

 

would dynomax duals 2.25 and 2 turbo mufflers fit under? any one have this?
or stick with the 3" with stock muffler?