DIAMOND ENGINEERING

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DIAMOND ENGINEERING Bolt Kit - Caliper - Front - FL/FX PB799S

Regular price £28⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Rocker Cover Only - M8 PB937S

Regular price £79⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission/Side Cover DE5022HP

Regular price £31⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission Top - Touring DE5026HP

Regular price £14⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission Top - Touring DE5024HP

Regular price £13⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission Top - FX DE5140HP

Regular price £20⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission/Side Cover DE5205HP

Regular price £39⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission Top Cover DE5206HP

Regular price £16⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission/Side Cover DE5276HP

Regular price £35⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission/Side Cover DE5251HP

Regular price £31⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - FL DE5437SCHP

Regular price £51⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - Touring DE5467SCHP

Regular price £34⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - Softail DE5469SCHP

Regular price £37⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transmission/Side Cover DE5444HP

Regular price £26⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transformation - Touring DE6045HP

Regular price £156⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - Softail DE5471SCHP

Regular price £44⁰⁰ GBP
DIAMOND ENGINEERING Bolt Kit - Transformation - OE - Touring DE6047HP

Regular price £68⁰⁰ GBP

Very low stock (1 unit)
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DIAMOND ENGINEERING Bolt Kit - Transformation - OE - FLT DE6051HP

Regular price £74⁰⁰ GBP
DIAMOND ENGINEERING Bolt Kit - Transformation - OE - Touring DE6049HP

Regular price £79⁰⁰ GBP

In stock (6 units)
DIAMOND ENGINEERING Bolt Kit - Transformation - Touring DE6067HP

Regular price £164⁰⁰ GBP

Very low stock (1 unit)
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DIAMOND ENGINEERING Bolt Kit - Top Cover - 12-Point - FX PB589S

Regular price £33⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transformation - 12-Point PB618S

Regular price £310⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transformation - 12-Point - Touring PB635S

Regular price £138⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transformation - 12-Point - FLHT PB637S

Regular price £172⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - 12-Point - Side Cover PB569S

Regular price £83⁰⁰ GBP
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DIAMOND ENGINEERING 12-Point Transformation Bolt Kit - FLTR PB639S

Regular price £196⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - 12-Point - Side Cover PB822S

Regular price £62⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Transformation - 12-Point - Touring PB643S

Regular price £310⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - 12-Point - FL PB896S

Regular price £96⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - 12-Point - Touring PB930S

Regular price £75⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - 12-Point - FL/X PB931S

Regular price £73⁰⁰ GBP
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DIAMOND ENGINEERING Banjo Bolt - M10 x 1.25 PB886S

Regular price £19⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - Motor Mount - 12-Point - FL/X PB932S

Regular price £89⁰⁰ GBP
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DIAMOND ENGINEERING Head Bolt Washers - M8 - 8-Pack DE5458HP

Regular price £37⁰⁰ GBP
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DIAMOND ENGINEERING 12-Point Crankcase Bolt - Twin Cam - 3.75" PB838S

Regular price £16⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Kit - 12-Point Head - M8 - 8-Pack PB437S

Regular price £195⁰⁰ GBP
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DIAMOND ENGINEERING Nuts - Thin - Nylock - 1/2-20 10 PACK NJLF08P-10

Regular price £26⁰⁰ GBP
DIAMOND ENGINEERING Nuts - Flange - Exhaust - 5/16" x 24 NFF05P-50

Regular price £99⁰⁰ GBP

In stock (19 units)
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DIAMOND ENGINEERING Washer - Side Cover WN04P-100

Regular price £48⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 3/4" TC0406HP-10

Regular price £40⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 1/2" TC0404HP-10

Regular price £34⁰⁰ GBP
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DIAMOND ENGINEERING Bolt Assortment - 12-Point - Coarse - Short ZT05HP

Regular price £720⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 7/8" TC0407HP-10

Regular price £40⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 1-1/4" TC0412HP-10

Regular price £43⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 1-1/2" TC0414HP-10

Regular price £51⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 1-3/4" TC0416HP-10

Regular price £51⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 1" TC0410HP-10

Regular price £41⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 2-1/4" TC0422HP-10

Regular price £53⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 2" TC0420HP-10

Regular price £52⁰⁰ GBP
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DIAMOND ENGINEERING Bolt - 12-Point - 1/4"-20 x 2-1/2" TC0424HP-10

Regular price £54⁰⁰ GBP

Let customers speak for us

from 673 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