There are a variety of different exhaust systems available for the Ford Focus ST, and each will produce a different sound. Some will be better than others, so it’s best to hear sound clips and read feedback from other owners before making a decision. Some people have had the best success with cp-e(tm) pipes, while others swear by a full catback system.For more: http://www.nosynation.com/
3 inch is better than 2.5 inch
There are some pros and cons to upgrading your Focus ST’s exhaust system. The three inch exhaust system provides a louder and more powerful exhaust note. It also improves torque, low-end torque, and cylinder filling. The downside is a smaller exhaust can cut horsepower at high RPMs.
The Agency Power exhaust system offers a catalytic converter-less, after-cat setup, and three-inch downpipe. It increases peak horsepower and torque by 40lb-ft, and comes in an affordable package. The company also offers a similar exhaust system for the Focus RS. Another good choice is the GReddy Supreme SP 3” catback exhaust system, which uses stainless steel tubing and features four-inch dual tips.
cp-e(tm) pipes eliminate drone
If you’re tired of your Focus ST’s drone, cp-e(tm) exhaust pipes will get rid of it. These mufflers are made from stainless steel and have a satin finish for a clean, uniform finish throughout. Moreover, these pipes don’t add backpressure like other pipes do, so you’ll never have to worry about any lingering drone. What’s more, they’re made in the U.S.A. and come with a lifetime warranty.
GReddy Supreme SP 3” catback system
If you’re looking for a catback exhaust system for your Focus ST, then you’ve come to the right place. The GReddy Supreme SP 3” Catback System is designed to provide a smooth, powerful exhaust note while increasing your car’s performance. These mufflers feature a stainless steel outer construction, straight-through chambers, and a sophisticated exhaust system layout.
This exhaust system is backed by a Limited Lifetime Warranty. You can rest assured that you’ll enjoy years of trouble-free performance. Redline360 sells only genuine GReddy products.
MBRP 3” aluminized steel exhaust
If you’re looking to improve the sound of your Focus ST, an MBRP 3” aluminossteel exhaust system may be what you’re looking for. This cat-back exhaust system bolts onto your stock exhaust and doesn’t require any PCM tuning. Its dual-wall design and mirror-polished T304 stainless steel tip are sure to give your hot hatch a more aggressive tone.
MBRP has been providing performance exhaust systems for over 20 years and is now at the forefront of performance exhaust technology. Their team has decades of manufacturing and marketing experience and uses this knowledge to build exhaust systems that improve vehicle performance.
Borla Touring kit emits a low, muffled growl
The Borla Touring exhaust kit offers a low, muffled growl that’s great for long drives. The exhaust is built with premium T-304 austenitic stainless steel, which is superior to knockoffs made from T-400 series. Its smooth mandrel bends allow maximum flow while precision CNC manufacturing ensures a perfect fit. In addition to that, the BORLA exhaust system comes with a Million-Mile Warranty for optimum peace of mind.
Mountune 2.5″ piping limits exhaust flow
If you want to make your Focus ST sound better and get rid of drone, you can use the Mountune 2.5″ exhaust system. This exhaust system features 2.5″ AISI 304 stainless steel tubing and lazer cut flanges to limit exhaust flow and eliminate unwanted noise. This system is also made with consistent internal diameter to improve sound quality. However, keep in mind that its 2.5″ piping design limits exhaust flow and power.
You should consider the Mountune 2.5″ piping in addition to the turbocharged exhaust system if you want to increase your horsepower. The kit includes an intake pipe and a downpipe. The mountune kit comes with everything needed to install it. You should first remove the stock plastic crossover pipe to install the Mountune 2.5″ piping. The new crossover pipe is made of high-quality cast aluminum and is resistant to boost leaks. It also has an internal diameter that is larger than stock and is free of internal obstructions.