i found a shop near my house , thanks to nittany, who will do true duals, the only thing is the pipeing isnt mandrel bent, will this make a big hp difference ove a true dual that is mandrel bent? since its not mandrel bent should i go with 2.5" on each side or go with 3"? im gonna use hi flow cats for legal purposes

 

mandrel bent just means smoother bends.. so the flow should be better..

If you are going to do it, why half azz it?

 

well i didnt think of it as half azzing, just more cost eefective, the mandrel is 650.00 shipped + cost of install and the non mandrel is 300.00 -350.00 installed, i was told that if i go with 3" non mandrel bent that would be about the same as 2.5" mandrel. either way i have to use hi flow cats but if i go with 3" no mandrel wouldnt the power be about the same? plus the cats would calm the noise inside the car done a bit and i wouldnt go to jail . thanks for the reply

 

It's a little more than just smoother bends.

Exp: A 3" mandrel bent exhaust will be 3" the whole way, IOW it will never be crimped down to less than 3".

If it's not mandrel bent (pressure bent is what it's called, I think), a 3" pipe could be like 2.75", 2.5" (a little smaller) where it's bent...IOW, the pipe will "collapse" where it is bent.

If you're going to go with non-mandrel, then go with the 3". With mandrel bends, you could go with the 2.5" (or 3" if you really wanted to). JMO

 

is there really enough room for 3" dual pipes though?

 

don't you guys think that 2.5 inch duals even though crimped, would still flow just as good, if not better, than a single mandrel bent system?
i'm not sure but i would guess that it would

 

"don't you guys think that 2.5 inch duals even though crimped, would still flow just as good, if not better, than a single mandrel bent system?"

honestly...no probably not

the dual 2.5" pipes...at full diameter...only have about 25% more volume than a single 3" pipe. then you take into account the compression bent sections. if it's only compressed 1/2"....to make an approx 2" pipe (actually wouldn't be round...but for arguements sake)...that would leave the duals with 10% LESS volume than the 3" single system.

not to mention the physics behind fluid travel through a single pipe, compared to two pipes.
without getting too crazy into the physics of it. a single 3" pipe has 7.0 sq. in of cross sectional area, TWO 2 1/8th inch pipes have virtually the same cross sectional area but divided between the two of them. basics of fluid flow stat that a given "fluid" in this case air will travel with less resistence through the single pipe since there is less resistence with the walls of the tubes.

 

Go with the "mandrel bent" tubing, I just viewed a show on the "Hang'um channel" it was 2 guys garage, and the entire show was devoted to this subject. There IS quite a difference in flow between madrel and crimped.

You have a beautiful car, why put on a **** exhaust system? Your stock pipe that goes over the axle is stainless steel mandrel bent tubing.

JMHO

SteveC

 

BlueCamaro96,

Mandrel bent is the way to go, I see alot of the info has already been posted but I'll go and throw my vote in anyways. My dad has a friend who gained 5hp from going to a press bent system to a mandrel bent system (don't remember diameters except that it was a the same diameter on both systems) on a STOCK 92 Mustang GT. Now you'd get even more if you increased the system diameter too, unless you overkill it

 

IMHO, why spend twice the money for only 5-10 HP? if you have the money, then by all means, buy the better exh. system. but if money is at a premium, just get the dual 3" press bend. at the same time, it depends on which type of bender he uses. if it puts wrinkles in the pipe, then I would not do it. but if its smooth (albeit smaller diameter), then why not? also, you didnt mention if this is over the axle out the back, or dumps at the rearend. if this goes out the back, you will see more of a significant difference between the two since there's alot more bends.

chris

 

Sent PM Bluecamaro96

 

I couldn't agree more w/ IrocSS85. All the talk has been about more flow which boils down to a mere 5 hp for twice the cost just so you can brag about having a mandrel bent system. I've seen a street driven 76 TA w/a 455 that ran pressure bent dual 3" (over the axel too) running low 11's. Take that extra $300 and get some long tube headers and show the people that wasted the same cash on 5hp your tail lights.

Yes, dual 2.5" pressure bent pipes will flow more than a single mandrel 3". There is more area. Dual 2.25" vs single 3" = 7.95 in^2 vs. 7.07in^2.

More friction from the walls? BS. Realize there is 2x the amount of gasses flowing through a single pipe vs duals. Try half of the amount of gasses flowing through a section of pipe at any given moment at a smaller diameter which means less friction.

From the dynos I've seen. There isn't much peak gains from a dual system vs single, but the gains cover the whole curve. Which means you'll feel it more and get more use out of it.

If you're really worried about the crimped area and are going over the axel, just get a pair of cutouts installed before those bends to use when racing. If you aren't then the crushing won't be bad at all.

 

ex4.6 since you live close to me, when you get your true duals how about hooking me up on a deal on the loudmouth?

 

BlueCamaro96...you WANT duals




I'll hypnotize you if I need to.

But anyways yeah, true duals will give u more power across the power band.

 

lol i would like duals but i dont want turndowns because of the in the car noise, i would like over the axle duals, but for now lane at lanes wheels hasnt made the jig for over axle, and his mandrel bent system is almost 600.00 kinda pricey