SureShot

Duals have one advantage - you can hear what each rotor is doing. EG: I have an idle miss on one, two is perfect; both oil injectors are working (the spliced line is holding) etc..
Also, I just prefer the dual look.

10TH_ANNIV_T2

Someone here has to have access to some corner scales, no? I can't imagine that the L-R weight difference is more than a few lbs at most-- if you use a stainless tube which can have thinner walls and therefore be lighter. Doesn't matter at the block, the pipes have to come off at the same place, doesn't matter all the way back to the beginning of the hatch area as you're running down the center of the car. Only place it would matter is that last 3~4 feet of pipe and the muffler itself.

I'll have my Borla off shortly, and I could weigh the mufflers and the Y pipe. You really just need somebody to take the weights at each corner with two systems-- and NOT the stock setup, it's very heavy. Each of my Borla's weighs about 15lbs I'd guess, I've taken them off a few times over the years.

When all's said and done, I think you'll be surprised to find the net weight difference at each wheel to be a few pounds. Matters on a race track-- I'll concede a yes. Matters on the street?-- No way. You'd be better off spending $$$ for the weight bias cause on lighter wheels.

Performance difference? Don't know. Most of the other threads seem plausible to some degree. If you're racing, you are also concerned with less weight in general, and with the placement of that weight, so single does have that advantage.

Greg O.

Cwaters

Let me know how that SuperTrapp works out for you...I've been thinking aobut getting one of those for a while....


Cory

Kahren

iTrader: (13)

havign a hole int he bumper cut out for the tip doesnt help teh loos for a single. the same flow rates of dual and single , dual will be quiter. and btw pipe size matter a lot u cannot simply say single will flow more how do u figure? u can blow about the as hard thru a 3 inch straw as (2) 1.25 inch straws go figure out which exhasut u really want

RX-7Impreza

actually it can go either way

there are two main influences on flow. surface area friction and volume of the pipe.

you take a single 3 inch and two 2.5 inches and you will probably get slightly more with the single. but if you can get the volume advantages of the dual to override the increases in surface area then you can win with duals.

but then again none of that really matters because if you did have big enough pipes (which would be difficult) you would have added so much wieght you negated all your gains. so single is better.

now that i rambled so badly and made no sense i think you should do a little fiberglass work and then put the pipe in the center.

not really sure if this would work but it would look nice.

Justin

mazdaspeed7

The reason Im going single is so I can tune my powerband where I want it. You simply cant do that with true dual. And a single exhaust can easily have more top end power than a true dual. The reason true dual is used is because it needs not tuning, and has a broader powerband. That is straight from Rob at Pineapple racing.

For the people arguing 2 pipes will flow more than one, under soem condidions, they will, like the cross-sectional area of the 2 pipes together being much greater than the cross sectional area of a single pipe. If the cross sectional area of 2 smaller pipes together and one larger pipe are the same, the larger pipe WILL flow more. The 2 smaller pipes have more surface area for the same volume, which slows down the exhaust velocity.

Backpressure is NEVER good. If you want low rpm power and responsiveness, dont add backpressure, increase velocity of the exhaust pulses. Smaller pipes is one way to do this. For top end, you want to make sure you have enough flow so the velocity doesnt suffer. Small pipes do great for low end power, but they create turbulence as the exhaust gas volume increases. Large pipes flow well at high rpm, and make more power, but the velocity is too low on the bottom end, which hurts power.

Evil Aviator

It depends on your exhaust system, but you would probably get the best performance with about 1.75" ID header pipe, and increasing the diameter about 1/4" or so each time you add another piping section (ie at the header collection point, cat, muffler, etc.). If you want to keep the same ID pipe, then something between 1.75" and 2" ID would probably get the best performance.

Hehehe, that's why I put dual exhaust on my 20B car. Well, maybe not so much for looks, but I'm a cop magnet so I need to keep it quiet. Plus one more reason...
3) It intimidates the V-8 crowd

Be vewwy vewwy quiet; I'm hunting wabbits... and mustangs, and impalas, and vipers, and...

NZConvertible

Here's a suggestion: go pick up a bit of 2.5" pipe and muffler. Not too heavy is it? Easily lifted. Now go pick up your car. Lift it up and down a few times. Arms tired yet?
My point is you're talking about such a small percentage compared to the weight of the car. You need to keep weight reduction in perspective.

speedjw

Every ounce counts.