3RotorRocket

I tried using search but nothing showed up.What's better to have a dual or single exhaust for a Turbo II?

ilike2eatricers

There are countless threads about this topic. Do a search on duals and collected single.

Templeswain

Talk to mazdaspeed7. Or look for posts under his ID. He understands exhausts pretty well.

TakumiJr

Or talk to 1987RX7guy

mazdaspeed7

Turbos dont use the same principles as n/a's. You cannot go too big for hp, the only limiting factor on size is the diminishing returns. For a turbo, just make sure it flows well, thats all that matters. 3" single, or if you want it quieter, have a y pipe, and run duals.

J-Rat

iTrader: (2)

He ran duals on an N/A. And I doubt he will be responding to any posts.

deevious

Save weight, go for a single!

3RotorRocket

Good point there about the weight.What im worried about though is the heat and airflow.Wouldn't there be more air flow and it won't get as hot as quick as a single would.Is single better for a Turbo II?

Mr. Eccentric

3" single. The Apexi GT spec is a nice unit for the TII. Less weight contributing than would be with two cannisters and a y pipe.

3RotorRocket

Are these good cat-backs?

5Zigen Fire Ball series cat-back
5Zigen Cannon Ball series cat-back
HKS Dragger series cat-back

What would you guys suggest?

Aaron Cake

iTrader: (1)

He has been banned.

ilike2eatricers

If you are looking for big gains look for a downpipe/presilencer combo. Catback's do not give that big of a gain. You could always go for the 3inch turbo back systems out there but those are expensive.

Mr. Eccentric

Make sure the can is SS packed to deal with the heat. I doubt the 5Zigen is, HKS is as far as I know.

Like said above, the cat back will give you decent gains but if you go to a downpipe and 3" from the turbo back you'll see a greater return. Make sure you do the necessary mods to offset the new parts (wastegate etc.)

NZConvertible

It's really a non-issue. A dual system adds ~20lbs compared to a single, which is less than 1% of the car's total weight. You'll never notice that.
Heat isn't a problem, and flow depends entirely of the pipe sizes, not whether it's dual or single. People who make the blanket statement "single flows better than dual" don't understand simple fluid dynamics.

The three most important issues are cost, noise and appearance. Dual costs more, single is noisier and which looks better is entirely up to the individual.

3RotorRocket

I would like dual cause they look better but I just don't have alot of money to dump into a new exhaust.

TakumiJr

Sorry I didn't kno about that.

nization

I like the single option for cost effective and weight reduction, personally.

88IntegraLS

Wow!!!!

Bio-Weapon

Heh, yea. Cool.

And IMO, unless you get the second half circle filled in, duals look better on an FC.

Howi

iTrader: (2)

every little counts, not to mention 20lbs isn't little at all.
there aren't too many things you can pull out of a car that weighs over 20lbs by itself.

you're right, 20lbs isn't even a percent of your cars weight, but if you can strip your car as much as you can and save weight wherever you can, you can easily achieve a 200lb loss, which is nearly 10%.

howi

n4ji

iTrader: (1)

Mind if I ask why? Was it the hot girl in his avatar?

n4ji

iTrader: (1)

Nevermind, spoke to the man myself.

88IntegraLS

Well said. That is how I got my FC in the 2400 range. You would be surprised how much difference 250 pounds makes.

oregano

iTrader: (1)

20 lbs is a lot indeed.

also, a single pipe would have less surface area for an equal volume of air. less surface area = less friction, right?

Impreza2RX7

Well, I think the factory dual exhaust was merely for appearance. The CS Single drops 36lbs off of the car, too bad it dosent exit the passenger side though. I forget the formula, but there is a way to find out how big of a dual exhaust you would need to equal the flow of a single exhaust. If you're looking for a quiet exhaust, get a Racing Beat Dual exhaust though.