Help with Exhaust Deletes

[carma143]

I am planning to get a BRZ in the coming months and have noticed in the endless number of YouTube videos I have watched on the FRS/BRZ that the stock exhaust note isn't that great. I've found this exhaust delete mantioned in this video here:
http://dsportmag.com/showcase/scion-...13-asr-frsmd02


Am I correct when I say all one needs for their exhaust sound to improve like it is in the above video is to change out the exhaust deletes? If this is true, that would just be awesome.

[carma143]

I would also like to know the advantages and disadvantages of an aftermarket exhaust or delete.

[EvilBeaverFace]

So the only thing you want to change on the entire car is the exhaust note and that's it?

If it is then sure. If you think you want to change anything else then you might want to do more research.


EDIT
Advantage: Sound, little more power

Disadvantage: Your bumper becomes an aerodynamic parachute at speed

[carma143]

I've heard that replacing the exhaust can add a couple ft lbs of torque and marginal amounts of horsepower. Is that worth spending an extra $800-1000?

Edit: So adding an aftermarket exhaust generally makes the aerodynamics of the car worse?

[EvilBeaverFace]

Before I say anything else I will say what I have said in most other exhaust threads that I've posted in: Concerning the exhaust as a whole unit, start modifying it at the engine side and move back from there. You will see most gains and change with your header, then op/fp, then catback or axleback.

Most people say that the most effective power mod right off the bat for this car is headers and a tune.

Now for just an axle or catback: it depends and its debatable

it depends on how much of a gaping hole the exhaust you want leaves under the car. Stock muffler is pretty big.

counter arguments are: 1) you'll never see speeds where you notice in daily driving or even autocross. 2) Lighter weight and mo powa outweighs the aero problem. 3) Aftermarket exhaust XXX took it into consideration and their muffler also acts as a diffuser (so says Nvidia for the q300, borla has a diffuser that comes with their catback but really who knows? no wind tunnel testing has happened).

my current setup: borla header, nameless catted op/fp with helmholtz, stock cat back... sound is great, not too loud but I know its there and I have the good ole Subaru boxer rumble. Helmholtz stops any rasp that would have been there.

Edit: I'm not an expert and this is just my opinion. Please do more research on your own as well!

[carma143]

thanks for the advice. When I first get my bRZ I'm going to be focusing mainly on simple aesthetic mods costing in total under $500. Then I just want something that will make the BRZ all the more fun to drive in, this being the exhaust deletes($120). Then I'm planning to save money that I could spend on aftermarket parts for something in the future.(What, I do not know).

[carma143]

Will I need to tune my car for adding exhaust deletes?

[FR-S Matt]

You shouldn't be doing an exhaust delete if you plan on upgrading the exhaust past the catback. Just some helpful advice before your car ends up sounding awful.

[Malt]

Disadvantage #2: Your car will be loud as hell and wake up your entire neighborhood in the mornings and make you look like a prick to everyone around you when you drive your car.

Seriously OP, leave the muffler deletes for the track cars and put a real exhaust on your car. The power gains from an exhaust delete are minimal. If you are looking for a place to spend $500 then I'd suggest an open flash tuner. Probably the best $500 you can spend on this car if you don't plan on going forced induction in the very near future (OFT doesn't currently have any FI maps but will in the future). Add a header to your car and run E85 and you'll get 95-98% of the current potential power potential these cars are currently showing on dynos while in NA form for around $1000 total cost. Cat backs might make your car sound louder but they don't do much for horsepower, despite what all those pretty dyno charts on the vendors website may lead you to believe.

EDIT:

Originally Posted by EvilBeaverFace

...
3) Aftermarket exhaust XXX took it into consideration and their muffler also acts as a diffuser (so says Nvidia for the q300, borla has a diffuser that comes with their catback but really who knows? no wind tunnel testing has happened).

Actually, there has been some aero simulation done on rear diffusers. The testing was done with an aftermarket rear diffuser made by wonderbar here on the forums. http://www.ft86club.com/forums/showt...01#post1249401

[EvilBeaverFace]

Originally Posted by Malt

Actually, there has been some aero simulation done on rear diffusers. The testing was done with an aftermarket rear diffuser made by wonderbar here on the forums. http://www.ft86club.com/forums/showt...01#post1249401

I'm aware. My statement was specifically for the Nvidia q300 and the Borla CBE + "diffuser". AFAIK though the Driveway Labs diffuser still hasn't seen real wind tunnel testing though, just models and real world data such as mpg. Not to discredit Wonderbar, more just to back up what I said earlier. I should have just included it all in my statement but I was about to go to sleep

[Malt]

Originally Posted by EvilBeaverFace

I'm aware. My statement was specifically for the Nvidia q300 and the Borla CBE + "diffuser". AFAIK though that specific diffuser still hasn't seen real wind tunnel testing though, just models and real world data such as mpg. Not to discredit the research, more just to back up what I said earlier. I should have just included it all in my statement but I was about to go to sleep

I think you'll find it extremely unlikely that any actual wind tunnel testing will occur on any aero product made available for this platform. I'm sure you are aware that the costs of such testing are extremely prohibitive and most people that actually perform them do so after countless simulations like what was performed on that diffuser. I think you'll find that the simulations are for the most part plenty good enough for our application and from what I've read the borla diffuser, while somewhat attractive, doesn't extend far enough past the bumper to do much of anything more than the factory solution.

Regardless, all of this isn't really on topic but we both agree that a muffler delete is the absolute worst case situation when it comes to aero concerns (not to mention they make you sound like a hormone raging 16 year old).

OP, save your money and get a real cat back exhaust. You and your neighbors ears will thank you.

[Kelbyat07]

Originally Posted by carma143

I am planning to get a BRZ in the coming months and have noticed in the endless number of YouTube videos I have watched on the FRS/BRZ that the stock exhaust note isn't that great. I've found this exhaust delete mantioned in this video here:
http://dsportmag.com/showcase/scion-...13-asr-frsmd02


Am I correct when I say all one needs for their exhaust sound to improve like it is in the above video is to change out the exhaust deletes? If this is true, that would just be awesome.

Muffler deletes are louder than average so you have to consider that if you don't want your neighbors to hate you. I personally would buy one because it is so cheap. It is a little raspy when you're cruising on the highway (I heard). So that depends if you are ok with driving a loud car everyday. The Invidia N1 is great for daily driving if that is what you want. It is loud but not too loud and great for driving everyday.


Pro: It is loud
Con: It is loud

[humfrz]

Originally Posted by carma143

I am planning to get a BRZ in the coming months .........Am I correct when I say all one needs for their exhaust sound to improve like it is in the above video is to change out the exhaust deletes? If this is true, that would just be awesome.

Well now, carma143, for average (non track) driving, if you want a more "sports car sound", I'd suggest you just go with an axle back muffler system; for example:

http://shop.namelessperformance.com/...eback-exhaust/

(get it with the muffler option)

It's simple, easy to install, relatively economical and sounds good.....

[FrsDuke]

Compromise

http://shop.namelessperformance.com/...ed-track-pipe/

I love my track pipe, but worry how loud it'll be once I get my header.