PROX – Page 4 – Bill's Exhausts

PROX Piston Kit 01.1225.B

Regular price £79⁰⁰ GBP

Low stock (3 units)
PROX Piston Kit 01.1225.C

Regular price £79⁰⁰ GBP

Very low stock (1 unit)
PROX Piston Kit 01.4325.B

Regular price £104⁰⁰ GBP

Low stock (2 units)
Sold out

PROX Piston Kit 01.4325.C

Regular price £104⁰⁰ GBP
Sold out

PROX Piston Kit 01.4325.D

Regular price £103⁰⁰ GBP
£14.00 off

PROX Piston Kit 01.2435.B

Sale price £145⁰⁰ GBP Regular price £159⁰⁰

In stock (101 units)
£14.00 off

PROX Piston Kit 01.2435.A

Sale price £145⁰⁰ GBP Regular price £159⁰⁰

In stock (7 units)
£12.00 off

PROX Piston Kit 01.1414.A

Sale price £145⁰⁰ GBP Regular price £157⁰⁰

In stock (58 units)
£12.00 off

PROX Piston Kit 01.1414.B

Sale price £145⁰⁰ GBP Regular price £157⁰⁰

In stock (6 units)
£14.00 off

PROX Piston Kit 01.2435.C

Sale price £145⁰⁰ GBP Regular price £159⁰⁰

Very low stock (1 unit)
£6.00 off

PROX Piston Kit 01.2020.250

Sale price £74⁰⁰ GBP Regular price £80⁰⁰

In stock (34 units)
PROX Piston Kit 01.3180.050

Regular price £67⁰⁰ GBP

In stock (7 units)
PROX Piston Kit 01.3180.000

Regular price £67⁰⁰ GBP

Low stock (3 units)
Sold out

PROX Piston Kit 01.3180.100

Regular price £62⁰⁰ GBP
£6.00 off

PROX Piston Kit 01.1111.B

Sale price £67⁰⁰ GBP Regular price £73⁰⁰

In stock (8 units)
Sold out

PROX Piston Kit 01.3180.150

Regular price £62⁰⁰ GBP
£9.00 off
PROX Piston Kit 01.1338.A

Sale price £138⁰⁰ GBP Regular price £147⁰⁰

In stock (10 units)
£6.00 off

PROX Piston Kit 01.1111.C

Sale price £67⁰⁰ GBP Regular price £73⁰⁰

In stock (11 units)
£9.00 off

PROX Piston Kit 01.1338.B

Sale price £138⁰⁰ GBP Regular price £147⁰⁰

In stock (38 units)
£9.00 off

PROX Piston Kit 01.1338.C

Sale price £138⁰⁰ GBP Regular price £147⁰⁰

Low stock (4 units)
Sold out
£16.00 off
PROX Piston Kit 01.1339.A

Sale price £138⁰⁰ GBP Regular price £154⁰⁰
£14.00 off

PROX Piston Kit 01.2406.C

Sale price £133⁰⁰ GBP Regular price £147⁰⁰

In stock (16 units)
£16.00 off

PROX Piston Kit 01.1339.B

Sale price £138⁰⁰ GBP Regular price £154⁰⁰

In stock (6 units)
£3.00 off

PROX Piston Kit 01.3338.A

Sale price £133⁰⁰ GBP Regular price £136⁰⁰

Low stock (3 units)
£14.00 off

PROX Piston Kit 01.2427.C

Sale price £138⁰⁰ GBP Regular price £152⁰⁰

Low stock (2 units)
£3.00 off

PROX Piston Kit 01.3338.B

Sale price £133⁰⁰ GBP Regular price £136⁰⁰

Very low stock (1 unit)
£4.00 off

PROX Piston Kit 01.3410.B

Sale price £141⁰⁰ GBP Regular price £145⁰⁰

Very low stock (1 unit)
£4.00 off

PROX Piston Kit 01.3410.C

Sale price £141⁰⁰ GBP Regular price £145⁰⁰

Very low stock (1 unit)
£3.00 off
PROX Piston Kit 01.4337.A

Sale price £133⁰⁰ GBP Regular price £136⁰⁰

In stock (7 units)
£4.00 off

PROX Piston Kit 01.3410.A

Sale price £141⁰⁰ GBP Regular price £145⁰⁰

Very low stock (1 unit)
£3.00 off

PROX Piston Kit 01.4337.C

Sale price £133⁰⁰ GBP Regular price £136⁰⁰

Low stock (3 units)
PROX Piston Kit 01.4406.B

Regular price £141⁰⁰ GBP

Low stock (2 units)
PROX Piston Kit 01.4406.A

Regular price £141⁰⁰ GBP

In stock (32 units)
PROX Piston Kit 01.6105.B

Regular price £71⁰⁰ GBP

In stock (178 units)
PROX Piston Kit 01.4406.C

Regular price £141⁰⁰ GBP

Low stock (4 units)
£3.00 off

PROX Piston Kit 01.4337.B

Sale price £133⁰⁰ GBP Regular price £136⁰⁰

In stock (29 units)
PROX Piston Kit 01.6105.A

Regular price £71⁰⁰ GBP

Low stock (3 units)
PROX Piston Kit 01.6105.D

Regular price £71⁰⁰ GBP

Low stock (3 units)
£14.00 off

PROX Piston Kit 01.6343.A

Sale price £104⁰⁰ GBP Regular price £118⁰⁰

In stock (44 units)
PROX Piston Kit 01.6105.C

Regular price £71⁰⁰ GBP

Low stock (4 units)
Sold out
£14.00 off

PROX Piston Kit 01.6343.C

Sale price £104⁰⁰ GBP Regular price £118⁰⁰
£14.00 off

PROX Piston Kit 01.6343.D

Sale price £104⁰⁰ GBP Regular price £118⁰⁰

Very low stock (1 unit)
Sold out
£15.00 off

PROX Piston Kit 01.6338.A

Sale price £155⁰⁰ GBP Regular price £170⁰⁰
£15.00 off

PROX Piston Kit 01.6338.B

Sale price £155⁰⁰ GBP Regular price £170⁰⁰

Very low stock (1 unit)
£15.00 off

PROX Piston Kit 01.6338.C

Sale price £155⁰⁰ GBP Regular price £170⁰⁰

Very low stock (1 unit)
£25.00 off

PROX Piston Kit 01.6427.A

Sale price £145⁰⁰ GBP Regular price £170⁰⁰

Low stock (2 units)
£25.00 off

PROX Piston Kit 01.6427.C

Sale price £145⁰⁰ GBP Regular price £170⁰⁰

Low stock (2 units)
£5.00 off

PROX Piston Kit 01.6521.A

Sale price £159⁰⁰ GBP Regular price £164⁰⁰

Low stock (2 units)
Sold out

PROX Piston Kit 01.6509.A

Regular price £172⁰⁰ GBP
£5.00 off

PROX Piston Kit 01.6521.B

Sale price £159⁰⁰ GBP Regular price £164⁰⁰

Very low stock (1 unit)

Let customers speak for us

from 674 reviews

Will Be Back!

I recently purchased the Arrow Race-Tech Slip-On Exhaust (Aluminum Dark) for my Kawasaki Z900 (’17–’24), and I couldn’t be happier. The quality is top-tier—lightweight, beautifully finished, and it gives the bike the deep, aggressive sound it should’ve had from the factory. Throttle response feels smoother, and the overall riding experience is noticeably more exciting.

Huge shoutout to Bill from Bills Exhaust. His communication was excellent from start to finish—quick replies, honest info, and genuinely great customer service. The exhaust shipped fast with no delays, no issues, and no backorder nonsense. Exactly what you want when ordering parts for your bike.

If you’re on the fence, go for it. The exhaust is incredible, and Bill makes the whole process even better. Highly recommend!

Brian Brayley

12/01/2025

71856AKN Arrow Race-Tech Slip-on Exhaust, Aluminum Dark for Kawasaki Z900 17-24

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.

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