DIAMOND ENGINEERING

Let customers speak for us

from 326 reviews

2025 BMW S1000rr

Bill is amazing!! Customer service top notch! Trust Bill with all your motorcycle needs! Best prices and fast shipping and in stock items! I purchased a Sc project for my new bike and he had it in stock and provided same day shipping with a discount!!

Morris Leday

05/16/2025

SC-Project CR-T Slip-on Exhaust M1000RR / 2020-2025 S1000RR / 2020-2025 S1000RR M Package / 2020-2022 S1000RR Sport / 2020 B33-50CR

LV Muffler

I love it….. thanks again Bill for upgrading me and the super fast shipping!!! Sound is amazing

Nicole Gassett

05/16/2025

LEOVINCE LV Corsa Muffler - Carbon Fiber Ninja 400/500 2018-2024-2025 15400CU 1811-4304

Perfect

The perfect finishing touch for my ZX4RR. Much lighter than stock and looks great! Can't go wrong with carbon fiber, sounds just as awesome.
Bill was great with communication also. I highly recommend.

Heather Goulet

05/14/2025

M4 slip-on with X96 carbon fiber canister and carbon fiber heat guard 2023- 2025 Kawasaki ZX-4RR KA4414

Great

Sounds amazing couldn’t be happier.

Pedro Tolentino

05/05/2025

SC-Project CR-T titanium exhaust, with de-cat link pipe Ninja ZX-10R /RR 2016-2020 K22-DET36T

Great experience & great product

Bill is really helpful. Initially, I placed an order for another exhaust. I realized it was not what I was looking for and Bill had no problem modifying my order right away hassle free. My ZX6R sounds amazing with the M4 full system. FYI, if you’re looking for the GP19 full system, know that It is LOUD!

Walid Esiely

05/01/2025

M4 Exhaust Full System Black GP19 with canister ZX6R ZX6 2009 - 2025 KA6982-GP19

Beautifully Crafted

This exhaust is absolutely stunning. All the welds look great & it looks to be engineered to flow efficiently. I have an Akrapovic Raceline exhaust on my MT-09 & love it but this system is a few notches higher in quality. Can't speak to the sound & performance as my R9 has yet to be delivered but I have no doubt that it will perform exceptionally & sound great!

Gaspar Oquendo

04/29/2025

71241PTZ Arrow Yzf R9 2025 Competition Evo Titanium Full system exhaust WITH db killer

Awesome customer service

Bill replied to any questions I had in a timely manner and then provided me with shipping tracking numbers throughout the whole process. From time of ordering to it being on my bike only took like 1 week

Nedas Gailius

04/28/2025

Arrow 71903PR Pro-Race Titanium Slip-On Exhaust BMW S1000RR / M1000RR 2020-2025

Excellent Exhaust & Service

Bought a Graves exhaust for my CRF450RL and it looks and sounds great. Top of the line build quality. Placed a late day order and it shipped the same day. Arrived in a remote town near ND/Canadien border in five days. Got precise order info, shipping confirmation, and tracking info start to finish.

RANDALL L SIMPSON

04/26/2025

Graves MotorSports Honda CRF450RL / L / X Full Exhaust Aluminum - Blue EXH-19C4X-FTAB

Graves carbon slip on

Great quality well packaged. Fits as it should 2019 zx6r

Chuck Carper

04/25/2025

Graves Motorsports Zx-6r Cat-Back Slip-On Carbon Exhaust 2019-2025 Exk-19zx6-Cbtc

10000000000 recommendable

I highly highly recommend this product I’m a very unique person that wants a perfect thing for my stuff I mostly can’t find the right things but this was one of the perfect things I found and it fit perfectly.

Elverh Melendez

04/24/2025

LEOVINCE LV Corsa Muffler - Carbon Fiber Ninja 400/500 2018-2024-2025 15400CU 1811-4304

Arrow Pro Race Exhaust

Great exhaust! Installed it once I received it! Sounds amazing and it fits perfectly for my 2024 Cbr650r but there were no instructions.

Phillip Khuu

04/16/2025

71069PR Arrow Pro-Race Racing Full Exhaust TITANIUM PRO-RACE SILENCER + STAINLESS STEEL COLLECTORS CBR650R 2024- 2025

Empire dual slip on

The quality of this system is amazing. Looks way better in the flesh than in pics online that's for sure. I'll be installing it tonight and I absolutely cannot wait !!!!

Joe Kalnins

04/12/2025

Empire industries Dual slip on exhaust for 2012 -2024 CAN-AM Outlander EMP-OUT-DSLP

2025 Softtail ST Fitment

After purchasing a 2025 HARLEY DAVIDSON Softtail 117 ST. I wanted an exhaust system that was a 2 into 1 .looked great. Sounded good.

Anonymous

04/11/2025

VANCE & HINES 2-into-1 Supersport Exhaust System - Brushed - Softail 27337

Fantastic service and exhaust

I was looking for a 2025 z900 exhaust for my bike. I purchase a first one with Cycle gear and after delivery I noticed that it was the wrong one. I find bill website by my own research he took his time to call me and explain me what I need to buy on the exhaust after the purchase the shipment arrived really quick. That guy is amazing I highly recommend check him out if you need parts and exhaust for your bike. Great service and assistance and quick to respond

Eric Kolani

04/11/2025

LEOVINCE Black LV-10 Muffler for Z900 2017-2024 ABS 15204B 1811-3453

Amazing customer service. Love the exhaust. Super fast shipping

Joshua Contreras

04/10/2025

Vandemon Yamaha R7 MT07 FZ07 XSR700 Tracer 700/GT Tracer 7/GT Titanium Exhaust System YAMAMT07EXHTITAN

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