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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 05-21-2012, 03:54 PM   #18
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Originally Posted by PERRIN_Jeff View Post
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!
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.
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Old 05-21-2012, 09:40 PM   #19
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Dual tip center exit exhaust FOR THE WIN!! Make it happen Perrin!
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Old 05-21-2012, 10:02 PM   #20
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Originally Posted by serialk11r View Post
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.
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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.
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.
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Old 05-21-2012, 10:05 PM   #21
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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.
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Old 05-22-2012, 03:44 AM   #22
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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.
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Old 05-22-2012, 04:13 AM   #23
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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.
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Old 05-22-2012, 04:15 AM   #24
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I was under the impression that removing emission control items made the car non-roadworthy.
I assume good catback includes a replacement catalytic converter?
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Old 05-22-2012, 04:26 AM   #25
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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...
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Old 05-22-2012, 04:40 AM   #26
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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.
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Old 05-22-2012, 04:56 AM   #27
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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.
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Old 05-22-2012, 05:26 AM   #28
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That depends on the country...
Usually in Italy the pre-cat is enough to pass emission control, if the car is well warmed up.
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Old 05-22-2012, 11:32 AM   #29
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Quote:
Originally Posted by DanPO View Post
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.
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.


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Old 05-22-2012, 11:41 AM   #30
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Wow, that is ehhhhh.... special
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Old 05-22-2012, 11:57 AM   #31
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Love the Prova exhaust, HATE the diffuser.
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Old 05-22-2012, 06:50 PM   #32
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^I agree! I don't like how you can see the exhaust pipe from a distance...
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Old 05-23-2012, 02:37 AM   #33
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They could have fit just a mesh grill there, at least it would look like a race car.
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Old 05-23-2012, 09:41 AM   #34
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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.
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