CASTROL

Let customers speak for us

from 552 reviews

very easy install

very easy install. makes it good for the neighbors and easy out for a trackday

DPGolino

09/02/2025

M4 Q1 Quiet Insert

great piece for my GSX-R 600

great piece for my GSX-R 600. Was easy to install. I ordered the level 1 baffle with the snap ring. Sounds great and has a little more punch.

DPGolino

08/27/2025

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

Very happy with my Austin Racing product!

Very happy with my Austin Racing product! Sounds great and look very good! It was almost a 8 weeks wait, so plan for it. They arrived decently packed and protected with several stickers.

Benjamin

08/26/2025

Austin Racing 2024-2025 DUCATI HYPERMOTARD 698 MONO TWIN EXIT SLIP-ON EXHAUST SYSTEM

Great product and excellent service

The product's quality is commendable, and the service provided exceeded expectations. Although the exhaust system was initially estimated to be delivered within 4-5 weeks due to a backorder, the item arrived within 1.5 weeks. Furthermore, communication was consistently effective, with regular email updates provided.

Dhiraj B

08/21/2025

IN STOCK SC-Project slip on exhaust Ninja ZX-6R 636 / 2013-2025 K35-T36C

Sounds Great

Sounds great pretty easy installation

Anonymous

08/20/2025

Empire industries big 3 power package with air box for raptor 700 15 - 25

Arrow Pro Full Exhaust System

Sounds like a beast on my 2024 cbr650r , package came a bit damaged and took longer than expected but was well packaged inside.

Gustavo H.

08/19/2025

71069PR Arrow Pro-Race Racing Full Exhaust TITANIUM PRO-RACE SILENCER + STAINLESS STEEL COLLECTORS CBR650R /CB 650 R2024- 2025

Sounds amazing

Sounds amazing, burps/pops perfect! thanks!!

Snupe

08/19/2025

M4 Exhaust Carbon Fiber Street Slayer Slip On 2009 - 2025 ZX6R KA6914

Epic exhaust

Epic exhaust, fast shipping, initially I had to return due to unforeseen circumstances, great to deal with and cheapest online.

Chris

08/18/2025

Graves Exhaust Full System Works For Wr250r + Wr250x 2008-2019 Exy-08wr2-Fstw

Bills Exhaust is the best customer service i have ever had the pleasure of dealing with

Bills Exhaust is the best customer service i have ever had the pleasure of dealing with. He is a man of his word. I highly recommend.

Michael S.

08/13/2025

Austin Racing GP1R DE-CAT exhaust slip-on for 2021 - 2025 KAWASAKI ZX10R

In stock and fast shipping

In stock and fast shipping. Super helpful and responsive…10x better than my experience at Motomillion.

Brian

07/31/2025

IN STOCK Arrow Panigale V2 955cc 2020 -2024/Streetfighter V2 22/24 Racing Titanium Work Exhaust (R+L) With Welded Stainless Steel Link Pipe 71160pk

Exactly what was described

Exactly what was described, a quality Mikuni part for my dirt bike carburetor.Bike runs great, thanks to Bill’s Exhaust

Steve

07/29/2025

MIKUNI Pilot Jet #40 4-Pack VM22/210-40

Fast delivery and perfect genuine product from Japan itself

Fast delivery and perfect genuine product from Japan itself. Couldn’t have been more happier

Suraj

07/29/2025

Yoshimura BLUE Japan Machine Bent R-11Sq R Titanium Cyclone Dual Bke cover Exhaust For Hayabusa 22-25 110-592-A16G0

Nice small footprint pipe

The pipe performs well with a lighter smaller footprint. They did fit the 2025 Tenere 700 US model but came with two O2 sensor bung holes even though the US 25 Tenere 700 only has the one up front. Their online picture of this pipe only had one. And there was only one plug provided. So if you wanted to remove the sensor entirely you'll need to buy another plug separately.

Nick

07/28/2025