PROX – Page 8 – Bill's Exhausts

¥200 off

PROX Piston Kit - Standard - KTM 50SX 01.6012.A

Sale price ¥9,600 JPY Regular price ¥9,800

Low stock (4 units)
¥200 off

PROX Piston Kit - Standard - KTM 50SX 01.6012.B

Sale price ¥9,600 JPY Regular price ¥9,800

In stock (57 units)
¥1,200 off

PROX Piston Kit - Standard - KTM 65SX 01.6022.A

Sale price ¥9,600 JPY Regular price ¥10,800

Low stock (4 units)
¥1,200 off
PROX Piston Kit - Standard - KTM 65SX 01.6022.B

Sale price ¥9,600 JPY Regular price ¥10,800

Low stock (2 units)
PROX Piston Kit - Standard - KTM 125SX 01.6220.B

Regular price ¥19,900 JPY

Very low stock (1 unit)
PROX Piston Kit - Standard - 125SX 01.6220.A

Regular price ¥19,900 JPY

Low stock (4 units)
¥1,500 off

PROX Piston Kit - Standard - KTM 200EXC 01.6249.A

Sale price ¥22,300 JPY Regular price ¥23,800

Very low stock (1 unit)
PROX Piston Kit - Standard - MXZ 500 01.5595.000

Regular price ¥16,900 JPY

Very low stock (1 unit)
Sold out
¥2,400 off

PROX Piston Kit - +.10" - MXZ 500 01.5595.100

Sale price ¥14,000 JPY Regular price ¥16,400
PROX Piston Kit - +.05" - MXZ 500 01.5595.050

Regular price ¥16,900 JPY

Low stock (2 units)
¥3,100 off

PROX Piston Kit - 300EXC TPI '18-'19 01.6388.A

Sale price ¥30,300 JPY Regular price ¥33,400

In stock (5 units)
¥1,500 off

PROX Piston Kit - Standard - 200EXC 01.6249.B

Sale price ¥22,300 JPY Regular price ¥23,800

Very low stock (1 unit)
¥3,100 off

PROX Piston Kit - 300EXC TPI 01.6388.B

Sale price ¥30,300 JPY Regular price ¥33,400

In stock (21 units)
¥3,100 off

PROX Piston Kit - KTM300EXC '17-'18 01.6387.B

Sale price ¥30,300 JPY Regular price ¥33,400

In stock (5 units)
¥3,100 off

PROX Piston Kit - 300EXC TPI '18-'19 01.6388.C

Sale price ¥30,300 JPY Regular price ¥33,400

In stock (7 units)
¥3,300 off

PROX Piston Kit - Beta RR300 '18-'19 01.7398.B

Sale price ¥31,900 JPY Regular price ¥35,200

In stock (43 units)
Sold out
¥400 off

PROX Ring Set 2.3122

Sale price ¥4,000 JPY Regular price ¥4,400
¥1,300 off

PROX Ring Set 2.1402

Sale price ¥8,800 JPY Regular price ¥10,100

Low stock (3 units)
¥400 off

PROX Ring Set 2.1111

Sale price ¥4,000 JPY Regular price ¥4,400

In stock (5 units)
Sold out
¥400 off

PROX Ring Set 02.5699.050

Sale price ¥2,600 JPY Regular price ¥3,000
PROX Ring Set 02.5699.100

Regular price ¥3,000 JPY

Low stock (3 units)
PROX Ring Set 02.5699.000

Regular price ¥4,000 JPY

Low stock (3 units)
PROX Ring Set 2.5603

Regular price ¥4,000 JPY

Low stock (2 units)
PROX Ring Set 2.5703

Regular price ¥4,000 JPY

Very low stock (1 unit)
Sold out
¥500 off

PROX Ring Set 02.2599.200

Sale price ¥3,100 JPY Regular price ¥3,600
PROX Ring Set 02.2599.150

Regular price ¥4,000 JPY

In stock (6 units)
PROX Ring Set 2.5807

Regular price ¥4,000 JPY

In stock (7 units)
Sold out

PROX Ring Set 02.5802.000

Regular price ¥4,000 JPY
Sold out

PROX Ring Set 02.5802.100

Regular price ¥4,000 JPY
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¥500 off

PROX Ring Set 2.5906

Sale price ¥2,600 JPY Regular price ¥3,100
Sold out
¥500 off

PROX Ring Set 02.2599.050

Sale price ¥3,100 JPY Regular price ¥3,600
Sold out

PROX Ring Set 02.2599.000

Regular price ¥4,000 JPY
Sold out
¥500 off

PROX Ring Set 02.2599.100

Sale price ¥3,100 JPY Regular price ¥3,600
Sold out
¥500 off

PROX Ring Set 2.2697

Sale price ¥3,100 JPY Regular price ¥3,600
PROX Ring Set 02.5601.000

Regular price ¥4,000 JPY

Low stock (2 units)
PROX Ring Set 2.5597

Regular price ¥4,000 JPY

Very low stock (1 unit)
PROX Piston Rings 2.1227

Regular price ¥8,000 JPY

Low stock (3 units)
PROX Piston Rings 2.134

Regular price ¥8,000 JPY

Very low stock (1 unit)
PROX Piston Rings 2.3408

Regular price ¥8,000 JPY

In stock (6 units)
Sold out
¥1,000 off

PROX Piston Rings 2.2402

Sale price ¥6,000 JPY Regular price ¥7,000
PROX Piston Rings 2.334

Regular price ¥8,000 JPY

Very low stock (1 unit)
PROX Piston Rings 2.3337

Regular price ¥7,200 JPY

Low stock (4 units)
Sold out
¥1,100 off

PROX Piston Rings 2.6427

Sale price ¥6,100 JPY Regular price ¥7,200
¥400 off

PROX Piston Rings 2.4124

Sale price ¥4,000 JPY Regular price ¥4,400

Very low stock (1 unit)
PROX Piston Rings 2.6012

Regular price ¥4,000 JPY

Very low stock (1 unit)
Sold out

PROX Piston Rings 2.4336

Regular price ¥8,000 JPY
PROX Piston Rings 2.6225

Regular price ¥8,000 JPY

In stock (5 units)
PROX Piston Rings 2.6228

Regular price ¥5,800 JPY

Very low stock (1 unit)
Sold out

PISTON RINGS 02.6249 2.6249

Regular price ¥0 JPY
Sold out

PROX Piston Rings 2.6351

Regular price ¥8,000 JPY

Let customers speak for us

from 660 reviews

Arrived super quick

Arrived super quick, no complaints

Anonymous

11/20/2025

IN STOCK M4 Exhaust GP Black Slip on GSXR600/750 2011-2025 SU6112-GP

Great customer support

Great customer support, fast shipping and delivery , and great quality exhaust . Sounds nice 👍🏼 would definitely recommend

Atticus

11/13/2025

IN STOCK M4 Exhaust GP19 Black Slip On 2009 - 2025 2026 ZX6R zx6 KA6922-GP19

Fast service and the pipe is very well made

Fast service and the pipe is very well made.

IN STOCK 72188PD Arrow H.D.1250 Pan America 20-25 Racing St. Steel De-Catalyzed Collector

Purchased the power core 4 along with the mega bomb header

Purchased the power core 4 along with the mega bomb header. Sounds great! Looks even better! Slammed them both on my 22’ KX 250f.

ROBERT T CLARK

11/11/2025

FMF Powercore 4 Muffler KX250F/X 2021-2023 042392 1821-2038

Was trying to find a reseller for Graves products. Stumbled upon this site. No hassles. Ships to Australia (big plus). Now I can mod my dream bike.
Exhaust is gnarly, obnoxious... exactly what I want! Makes all the right sounds.
I'd buy another one if I had another bike.
Super easy fitment, shaved off so much weight with the titanium build.
Absolute piece of art.

Nazzy

11/05/2025

Bill's Exhausts

Great price and amazing sound

Great price and amazing sound.

Michael Adams

10/27/2025

AKRAPOVIC Carbon Fiber Muffler NINJA 400 /500 2018-2025 S-K4SO6-APC 1811-3515

This system with a BT Moto tune sounds and feels amazing

This system with a BT Moto tune sounds and feels amazing. The weight reduction, power increase makes this bike handle even better.
The titanium exhaust system looks amazing.

Lou D

10/19/2025