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ITT, I will document weights of GT4 OEM parts and aftermarket parts. Documentation will list (and link, if possilbe) source and be grouped by category. As they accumulate, I'll pull reputable responses into the first couple posts.

Headers, OAP, Cats.
Per side unless otherwise indicated.
OEM GT4 manifold with cats and hangers: 12.6 lbs. Source: my bathroom scale.
OEM GT4 OAP: 12.0 lbs. Source: my bathroom scale.

Akrapovic Ti OAP: 4.2 lbs each. Source: JCviggen

Dundon GT4 street manifold: 7.6 lbs. Source: my bathroom scale.
Dundon GT4 OAP with cats and two V band clamps: 6.6 lbs. Source: my bathroom scale.
Dundon GT4 OAP to stock exhaust flange adapters: 2.8 lbs. Source: my bathroom scale.

Brakes.
Per corner unless otherwise indicated.
OEM GT4 Front Caliper (Iron): 9.3 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)
OEM GT4 Front Caliper (PCCB): 9.3 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)

OEM GT4 Front Disc (Iron): 24.2 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)
OEM GT4 Front Disc (PCCB): 15.2 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)

OEM GT4 Rear Caliper (Iron): 7.5 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)
OEM GT4 Rear Caliper (PCCB): 7.5 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)

OEM GT4 Rear Disc (Iron): 24 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)
OEM GT4 Rear Disc (PCCB): 13.5 lbs* (*981 GT4, assumed to be same as 982. Source: Essex)

Essex AP Racing Radi-Cal Front Caliper, pn CP9661-2S4L/3S4L: 6.2 lbs. Source: Essex
Essex AP Racing Radi-Cal 394mm Front Disc, pn CP9661-2S4L/3S4L: 21.5 lbs. Source: Essex

Essex AP Racing Radi-Cal Rear Caliper, pn CP9449-2/3S4L: 4.85 lbs. Source: Essex
Essex AP Racing Radi-Cal 380mm Rear Disc, pn CP5772-1016/1017GA: 19.1 lbs. Source: Essex

Interior.

front floor mats (both combined): 3 lbs. Source: FazedChicken
front trunk large plastic cover above battery area: 3 lbs. Source: FazedChicken
owners manual + flat tire kit + front trunk left/right side plastic inserts including all the content in them: 9 lbs. Source: FazedChicken

Exterior.

Battery.
OEM AGM 70Ah 430A DIN: 45.4 lbs

Antigravity AG-H4-40-Rs (40Ah) 12.9 lbs
Antigravity AG-H6-60-RS (60 Ah) 18.60 lbs

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Muffler Section.

OEM: 36.2 lbs, excludes hangers (unsure on strap). Source: Reedy
OEM: New style mount hardware: 2 hangers, strap: 4.2 lbs. Source: JCviggen
OEM: Old style mount hardware: Includes OAP strap: 4.2 lbs. Source: JCviggen

Cargraphic track/comp exhaust (non x-pipe): 28 lbs. Source: JCviggen

JCR Ti Valved Race Pipe with Megaphone tips, PDK bracket, all hardware: 18.0 lbs. Source: my bathroom scale

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Wheels and Tires.

OEM
OEM GT4 Front WITH 75% tread 245/35ZR20 Cup 2 n1 101Y: 46.4 lbs Source: my bathroom scale
OEM GT4 Rear WITH 75% tread 295/30ZR20 Cup 2 n1 95Y: 53.0 lbs Source: my bathroom scale

APEX
APEX SM10
19x9 et50 (JWL 1620 lbs): 21 lbs, Source: APEX
19x11 et46 (JWL 1620 lbs): 23.5 lbs, Source: APEX

APEX VS-5RS Forged
19x9" ET50 - 18.5 lbs, Source: APEX
19x10.5" ET44 - 20.1 lbs, Source: APEX
19x11" ET45 - 20.7 lbs, Source: APEX

APEX EC-7RS Forged
19x9" ET50 - 19.6 lbs, Source: APEX
19x11" ET45 - 21.4 lbs, Source: APEX

APEX VS-5RS Forged
18x9" ET50 - 17.8 lbs *requires smaller front brakes(PFC or 997 GT3/RS are common options), Source: APEX
18x10.5" ET44 - 18.8 lbs *requires smaller front brakes(PFC or 997 GT3/RS are common options), Source: APEX

APEX EC-7RS Forged
18x9" ET50 - 19 lbs *requires smaller front brakes(PFC or 997 GT3/RS are common options), Source: APEX
18x10.5" ET44 - 20.1 lbs *requires smaller front brakes(PFC or 997 GT3/RS are common options), Source: APEX

BBS
BBS FI-R
20X8.5 et61: 16.8 lbs
20x11 et50: 18.5 lbs

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Reserved.

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Reserved..

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Reserved...

Apex Wheels

Here are the wheel weights for our new forged designs for the GT4:

VS-5RS Forged
19x9" ET50 - 18.5 lbs
19x10.5" ET44 - 20.1 lbs
19x11" ET45 - 20.7 lbs

EC-7RS Forged
19x9" ET50 - 19.6 lbs
19x11" ET45 - 21.4 lbs

If you run smaller front (PFC or 997 GT3/RS are common options), you can shave more rotational mass and run our 18" wheels:

VS-5RS Forged
18x9" ET50 - 17.8 lbs
18x10.5" ET44 - 18.8 lbs

EC-7RS Forged
18x9" ET50 - 19 lbs
18x10.5" ET44 - 20.1 lbs


- Ryan

FazedChicken

I've weighed some misc stuff from my 718 S. Stuff that's shared with all 718 models as far as I know. Using a bathroom scale.

- 3 lbs front floor mats (both combined)
- 3 lbs front trunk large plastic cover above battery area
- 9 lbs owners manual + flat tire kit + front trunk left/right side plastic inserts including all the content in them

You could probably drain wiper fluid for another few lbs. I haven't checked to see the capacity of the system. I literally haven't used my wiper spray in the 4yrs I've had my current car.

Reedy

OEM Rear muffler = 16.4 kg's on my bathroom scales.

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Does this include the damped mounts? If not, I'll put mine on a scale in a week or two.

Reedy

No, those are still attached to my car. I didn't even know they could be removed. It's gotta be a pretty small difference.

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Bet they're at least a pound, maybe two. I'll measure mine sometime in the next couple weeks.

Reedy

And I will figure out how to remove them

JCviggen

I weighed the exhaust mounting hardware/brackets last weekend as I swapped from old style (w/ straps) to new style.

Old was 11 lbs total, new style 4.2 lbs. New style does away with OAP support.

Also:

Akrapovic Ti OAP weight is 4.2 lbs each.
Cargraphic track/comp exhaust (non x-pipe) is 28 lbs

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Is the new style you weighed the strap on the muffler strap and the two damped hangers? I'll have to look up pics the old style, didn't know OAP support existed tho my OEM headers had supports (included in my manifold weights).