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


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Old 12-21-2020, 10:42 PM   #15
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Welcome to the forum,
nobody really talks about lightweight headers, thats not really a topic of discussion.

im happy to offer some ways to lose weight tho:

if you want to loose weight, the first and second place to look is wheels+tires. im not sure but it **looks** like youre rocking federal 595 tires which are the heaviest tire in the milky way galaxy. every pound on your wheels+tires equates to be equivalent to ~ 10lb up on the car. so loosing 2 lbs on a header aint jack compared to 2lb on your tires. tirerack lists tire weight in the specs, indy500 are among the lighter options.

if youre serious about loosing weight, look into nonheated nonreclineable seats, titanium single exit catbacks(1 muffler weighs less), titanium front pipe, ditch your a/c, lightweight flywheel, carbon driveshaft, get a steering wheel with no airbag, yeah lightweight headers arent really a thing. im sure some headers weigh less, but there are better ways to slim down.

your invidia exhaust is probably lighter than factory, but a pig compared to a Titanium Tomei. a quick google says the invidia n2 weighs 22kg=48lbs,

The aftermarket headers weigh significantly less than stock. I'm sure they all weight similar amounts. I don't think it's discussed because people choose headers based on other things than weight. Curious if you offered a titanium header, if you could make money on the few people willing to pay for those few extra pounds. Then you could claim a 100% titanium exhaust too...

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Old 12-21-2020, 10:49 PM   #16
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Originally Posted by Ashikabi View Post
The aftermarket headers weigh significantly less than stock. I'm sure they all weight similar amounts. I don't think it's discussed because people choose headers based on other things than weight. Curious if you offered a titanium header, if you could make money on the few people willing to pay for those few extra pounds. Then you could claim a 100% titanium exhaust too...

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You're right, I just looked up the ace, surprise to my eyes, 6kg=13.2lb, and that's w its overripe too. The stock header alone is 21lb I guess, that's a nice weight saving.
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Old 12-21-2020, 10:58 PM   #17
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You're right, I just looked up the ace, surprise to my eyes, 6kg=13.2lb, and that's w its overripe too. The stock header alone is 21lb I guess, that's a nice weight saving.
I just remembered from when I took my stock ones off. They felt heavy AF. You think a titanium header would sell though?

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Old 12-21-2020, 11:25 PM   #18
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Originally Posted by HaXx View Post
You're right, I just looked up the ace, surprise to my eyes, 6kg=13.2lb, and that's w its overripe too. The stock header alone is 21lb I guess, that's a nice weight saving.
Stock OP is 4.5lbs + header 20.9 = 25.4lbs
Ace is 9.75lbs + OP 3.5lbs = 13.25. So ace is almost 12.15lbs lighter.

Stock CBE is 38lbs so if his is actually 48lbs that’s not doing anyone any favors.

I believe csg mxp touring 86 is 35lbs.

So OP could drop 25+ lbs and gain about 25whp and make his exhaust quieter by making the swap.
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Old 12-22-2020, 12:22 AM   #19
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Could drop 20lbs off the front just by switching to the AP Racing brake kit. And that's unsprung (and some rotational) mass as well.
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Old 12-22-2020, 01:12 AM   #20
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Or Wilwood for 30lbs
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Old 12-22-2020, 03:42 AM   #21
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Thanks all for the responses. Again I'm reducing weight in the car. Not looking at more power. At 2602lbs right now (no driver/half fluid/no junk in the trunk/LW battery/rear seat delete and other stuff removed) Shooting for 2580ish. I like the sound it currently makes, but could go a little more louder for weight loss. speedfactory headers are too loud. heard them in person. I'll keep searching. Best.
This may help with your sound problem:
I have the FT86 catted UEL & 2019 TRD SE exhaust. Though it's factory, I felt that the noise can still be a cop magnet. What I've done which is quite effective is I have wrapped the front pipe & mid pipe with Design Engineering Form-A-Shield which is basically a thick yet very light thermal insulation. This absorbed the tonal frequency of the pipes & created muffled the exhaust's mid-high "tin can" note & left what sounded like a bassy hum. My family can definitely notice how much quieter it is in the cabin. If you wrap the muffler/resonator, the sound will definitely be more muffled as this it's the last area where air & the metal reverberate.

Since you're also into weight reduction, have you also tried switching to aluminum/cf drive shaft? It's approx 12 lbs lighter than stock & lets you accelerate faster. Light racing wheels that are less than 18 lbs like Enkei RPF1, Enkei PF01, & Motegi MR140 to name a few fall in that category even at 18x8.5 vs 20 lbs of 17x7 stock will not only help reduce weight but also improve the handling.
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Old 12-22-2020, 09:18 AM   #22
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Weight reduction
Rear Total -57.5lbs
Remove Spare/tools -30lbs
DIY Rear seat delete kit - 25lbs and reduced in cabin noise
Catback Exhaust -2.5lbs

Middle Total -35lbs
Driver/Passenger Bucket Seats -24lbs
Carbon Fiber Driveshaft -12lbs
Decat FP -1lbs

Front Total -99.5lbs
Wilwood BBK -32lbs
Shorai Battery -24lbs
JDM AC Delete -14.5lbs never used the AC until AFTER removing it just for the fans, worked well.
Ace Header/OP -12lbs
Mini windshield reservoir -8lbs
Beatrush Crash bar -5lbs
Verus Injector covers -4lbs

Total Weight reduction -192lbs

Wheels dropped 3lbs a corner but tires added 3lbs so it was a wash but more grip.
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Old 12-22-2020, 09:26 AM   #23
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lightweight carbon driveshaft will have no improvement to acceleration (well technically .1%) aluminum one being much larger diameter will actually decrease acceleration and most people notice a noise at higher mph.
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Old 12-22-2020, 01:26 PM   #24
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Weight reduction

Total Weight reduction -192lbs
Nice weight reduction list. If you get the 12.7lbs exedy lightweight flywheel, you’d be at a nice -200 lbs.
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Old 12-22-2020, 02:33 PM   #25
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Nice weight reduction list. If you get the 12.7lbs exedy lightweight flywheel, you’d be at a nice -200 lbs.
Thanks.

If me and OP had manuals then LW FW for sure.

LW FW only “rotational” mass of value beyond static weight loss.
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Old 12-25-2020, 06:01 PM   #26
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At 6'0 230 i know the easiest and yet hardest weight loss mod.
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Old 12-25-2020, 10:03 PM   #27
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Or Wilwood for 30lbs

Wilwoods are lighter than AP Racing?
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Old 12-25-2020, 11:53 PM   #28
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Wilwoods are lighter than AP Racing?
Wilwood 4R are 32lbs lighter then stock. Not as good of brakes as AP, but also a lot cheaper and the lightest. Solid upgrade still like. Doesn’t change brake bias. For a DD it’s very good or an NA track build that’s had some solid weight reduction.
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