Stock Exhaust Weight
 

Any of the lucky few who've received their cars (BRZ or FRS) want to weigh the stock muffler? I'm curious to see how much weight can be saved by aftermarket exhausts! Thanks!

According to Fujitsubo cat-back is 18.6 kgs.

http://www.fujitsubo.co.jp/prods/detail/000000000000002107/00000000000000004740/00001473

The whole catback then is roughly 41lbs. I'm curious to see a direct comparison of aftermarket exhaust system weights. Like most cars, a set of custom headers should save a ton of weight over the cast manifolds.

me too! im all about that weight savings!!! free powa! lol

The HKS Spec-L claims half the weight of stock.

seems like we will need to add a spreadsheet to our exhaust thread with weights of each!:party0030:

You mean these tubular manifolds with built-in primary (EDIT: pre) cat? Clearly this isn't like most cars.

http://car.watch.impress.co.jp/img/c...RZBody_010.jpg

Turbowned, you're quite mistaken about the primary cat, which I've seen you post 2 times now lol. That's the precat, the primary cat is downstream.

Ugh, now I gotta dig through old threads to confirm... gimme 5 minutes!

Yep, you're right. Pre-cat. I think I read Draco-REX say it and I just regurgitated. You corrected him, too.

How about this!

http://blog.perrinperformance.com/wp...t1-550x410.jpg

http://blog.perrinperformance.com/wp...ht-504x550.jpg

Why is this off the car? Duh!

Thanks Jeff!! Haha I was hoping you would read this thread!!

outstanding work guys..:)... Keep it coming..

Bill

Perrin ftw! (LICENSE BRACKET!)

I just sold my Perrin Twin-Tip catback from my STi.. I am looking forward to something as high quality for the BRZ.

Our first version will be a dual tip setup, and today we played around with sound. Its amazing how quiet the car is with no catback. Fun times to come for sure!

I hope Perrin comes out with a straight back (center exit) race pipe with dual tips (no muffler). You would obviously need a different rear lower fascia/valance (whatever it's called) to make the center single exit pipe look nice. Would be cool if there was a carbon fiber option on the rear lower fascia/valance. This setup without a muffler would save a ton of weight and be an aggressive option for track go-ers.

yes yes yes!!!!! but i would love straight pipe single to dolphin tip :) and a carbon fiber exit delete on the other side :) but im sure anything they put out will sound and function amazing! :happyanim:

Please do something amazing with the sound. That's one of the weakest points on the car for me is the lack of a good exhaust note. I am still rocking a Perrin Catback on my Legacy GT that you guys discontinued a long time ago and I still think it's the best sounding exhaust for the LGT. Crackles, burbles, and even pops sometimes, great bass but no drone, perfect volume. Glorious.

Dual tip center exit exhaust FOR THE WIN!! Make it happen Perrin!

The second cat isn't monitored. The downstream O2 is located after the cat in the manifold and before the second cat further down.

Are you referring to a difference in construction? Because as far as the ECU is concerned, the cat in the manifold is the only cat on the car.

Oh, On-Topic post:

Because the HKS Spec-L specifically is designed for lightness and the manufacturer has stated a weight for it, it is now at the top of my list.

Weight matters with this car, so it matters to me more than ever.

I think the Spec-L will be too loud once you start playing with the headers and cats.

I'd like to see what happens to the power and torque curve removing the secondary cat and fitting a good catback.

I was under the impression that removing emission control items made the car non-roadworthy.

I assume good catback includes a replacement catalytic converter?

Correct me if I'm wrong but I always thought Catback exhausts replace whatever is behind the catalytic converter but you still would use your original cat...reason for the name catback. Unless your taking about the exhaust companies replacing the original cat with a high-flow cat? I feel like those exhaust would be really pricey...

As there are two cats emission won't be terribile with just the 1st one.
Obviously the best solution is to replace both of them with a 1st grade sport cats, but to just replace the 2nd with a straight pipe is cheap and won't turn on any CEL as it's not monitored.

I wasn't referring to being able to drive the car. I was referring to the legality of driving a vehicle with modified emission controls.

That depends on the country...
Usually in Italy the pre-cat is enough to pass emission control, if the car is well warmed up.

Prova has a center exit system available ;)

We are working on the details with Prova Japan, however this will also include the new lower rear section as well for the bumper.
http://www.jprova.co.jp/products/exh...0000001f13.jpg
http://www.jprova.co.jp/products/exh...0000001az6.jpg
http://www.jprova.co.jp/products/exh...0000001ayy.jpg

Wow, that is ehhhhh.... special

Love the Prova exhaust, HATE the diffuser.

^I agree! I don't like how you can see the exhaust pipe from a distance...

They could have fit just a mesh grill there, at least it would look like a race car.

Do any of these exhaust mods require ECU mods as well? I'm concerned that if I make a change it will screw something up.

As long as the changes are after the last O2 sensor, you won't need a tune. Generally, a "Cat-back" exhaust is after the cats and therefore won't need to be tuned for.

Agreed, also, if the reading of the post-cat O2 sensor is correct, regardless of what do you fit, you can leave the ECU alone. The auto-adaptive ability of the ECU will get the A/F ratio, spark advance etc right.
It's rare that a modern ECU of a NA engine is not able to compensate a full exhaust system.

You can have problem if the pre-cat O2 sensor position is very different, for example it happens when you fit a long tube header on a car which had short primary pipes and the original sensor plug very close to the engine. The delay of the reading of the sensor or the different wire lenght confuse the ECU. A good programmer can modify the target of the sensor or the delay of the reading.

This doesn't mean that a ECU remap can't improve the car, as there are also other characteristic of the management that are not subject to auto-adaptation, for example, throttle mapping, rev limiter, valve lift and timing if there is a variable system etc.

MAF based cars rarely have issues with any kind of bolt on exhaust pieces. The ECU sees more air flow and the car runs the proper air fuel ratio, so its perfectly. Proof of this is when someone dyno's an exhaust and shows the AFR curve before and after. Like this:

http://blog.perrinperformance.com/wp...fr-550x343.jpg

No, that is not the catback dyno results, just an example.

I'm not a fan of the muffler and how the pipe is routed, but I wouldn't mind having the rear diffuser and fabricating my own center exit.

Not a fan. Makes it look like the car has got it's junk all exposed.

Meh... the only people complaining about it will be crossing the finish line after I do. :D