I've had both single and dual exhaust systems on my NA FC.

Single is way too loud IMO.

Weight was the last concern for me. Sound and performance gains were the most i expected from both setups.

I actually felt the car was quicker with a dual 2.5" setup over a 3" single setup.

But this is all on the butt dyno, so no physical facts are shown.

Both were custom done jobs of course, and i will never get it done custom again unless i know the person who's doing the job is more skilled then the last.

Currently have the Greddy power extreme catback for my turbo FC...


Dual looks better.

-Justin

 

whoa. i this thread is still open?

 

how about from now on, everyone weighs the exhaust components they install before putting them on? then there will be no question = ) I'll go first... as soon as my stuff comes in

 

I had a single exhaust before , it was 3" all the way from down pipe to muffler.
right now I have a racing beat one.
single exhaust is better on high rpm , like 5000rpm+
I feel faster than the racing beat one.
dual exhaust has more torque on low rpm , less turbo lag , (i am running 0.7bar)
acceleration is slower than single after 5000rpm.
of course dual exhaust is lighter and quiet .
because I got two tickets about noise , so I switched to dual exhaust.

 

None of these things are because of the change in configuration, they're all due to change in pipe sizes. The sooner people understand that the better.

 

agreed, 3 inch duals does not equal 2 inch duals =) meaning, the torque and high end power comes from the diameter of the pipes rather then the single or double set ups...i think O.o


regardless, i can't help but remember that old saying... 100 lbs off = .1 secs of your ETs..
so i guess every bit counts when you are racing. Even if the exhaust did weight only 15lbs more then single can, if i was a hardcore racer i would take this in consideration.

 

I'm not too sure about america, but here in Australia, having no cat present on a car that came with one from the factory can mean a $5k fine on the spot.

Can anbody (nzconvertible:P) suggest a quality 3" dual turbo back exhaust? or should i just go custom pre-cat and dump and get a name brand catback(what is good)?

I would opt for racing beat, but i really dislike the look of the stainless steel mufflers, i prefer to have cannons, looks much more aggressive =]

BTW, it is a 89 Series 5 turbo.
Cheers, Bryan

 

So that would be a whopping 0.02s gain, if that old saying was right, which it ain't...

Save yourself a bunch of money. Custom all the way baby!

 

Saving weight for racing applications? I'm not familiar with SCCA and other organizations rules and regulations, but just run open headers since it's a race car. Best exhaust system you can have performance-wise.

 

This is for a streetable car btw :P, i was always under the impression that custom jobs were more expensive than the brand name kits you can buy.

What material should it be made of?
I know i want 3"(3"1/4 ??) from turbo through high flow cat to a Y with 2 nice mufflers (should i get these custom also?) with minimal bends.

How much $$ should this run me?

I am also considering an APEXi ECV(exhaust control valve) to keep the neighbours happy and also the legal dB limit in my state is 90dB . Has anybody had good/bad experiences with these? I havn't heard any horror stories yet.. but i can imagine it wouldn't be pretty if you hit high boost with it on maximum restriction

Thanks for your time,
Bryan

 

"Save yourself a bunch of money. Custom all the way baby! "

now that i agree with =)

 

I think what he means is a stock y-pipe and mufflers compared to a straight pipe.
Also when my y-pipe was cracked from a rear collision i got a sinlge and it wieghed alot les than the y-pipe and mufflers setup.So i believe it and know it's a considerable difference.

 

Weight - a total non-issue. The weight of a muffler and a short bit of pipe+ a Y-splitter isn't going to be more than a few kgs. - why drive an FC which is already a heavier car than it could be if you are that concerned about weight?


I have to argue this.the weight is considerable different.I should know i have my y-pipe and mufflers right now in my backyard,and the weight saved over my single has to be at least 20lbs.I will weigh it as soon as i can and let you guys know what it weigh's at.My guess is 35-40lb's.Note the single i have only weigh's about7or 8 lb's i know this because i can pick it up with one finger.But lets just round it out too 10lb's.