XFORCE - BMW F20 M135i Varex Valved Cat Back Exhaust System

Why Buy A Performance Exhaust?

Performance exhausts are designed to increase power and noise adding to the overall experience of your vehicle. This is achieved through easier “flow” of exhaust gasses and pressures exiting the engine. As a result of easier exhaust flow, the engine of your vehicle has the capacity for increased pressure resulting in an increase of power. Exhaust gases leaving your engine, provide much more capacity to produce power. To gain the most power from your engine, the best option is to complete a full exhaust upgrade (engine back or turbo back).

What Size Catback Should I Buy?

One of the most common questions we get. What size catback exhaust should I get. If you’re after the loudest sound then a 3”catback exhaust sytem is the best option. Not only will you benefit with the best sound, if you plan to work on your engine you will gain further performance gains compared to a 2.5”.

The benefits of a 2.5” system is that they’re more suited for the street and casual cruising. Not too quite and not too loud.

What Size Headers Should I Buy?

Bigger, isn’t always better in this case.

1 3/4" headers are suited for highly worked on engines and provide high flow. You will also see high performance gains and a slightly better and louder note. With both 1 ¾” and 1 7/8” headers you should hear more cracks and pops.

With 1 7/8” headers these are more suited to motors utilising force induction, for example a supercharger. There shouldn’t be much difference with sound and performance compared to 1 ¾” it mostly depends on the engines upgrades.

What Material Exhaust Should I Buy?

This is all depends on how long you’re going to keep the car. If you plan on keeping your car for five years, then Stainless Steel is the best option in comparison to other materials.

Warranty periods on Stainless Steel exhaust last for five years, were as other materials warranties are two years.

What Systems Are Direct Fit?

Majority of systems from XFORCE, Di Filippo, Manta, Msa, Ballistic are direct bolt. Below are some noted fitment issues with products:

• Headers – some components of the engine may need to removed. Please see some examples below
• Headers - VE/VF steering shaft needs to be removed to install headers
• Headers - HSV GTS GEN-F is a tight squeeze and 1 3/4” headers are recommended over 1 7/8”
• XFORCE Chrysler 300C catback – custom cat section needs to be fabricated
• XFORCE Nissan 350z/370z – may require more labour than usual
• XFORCE Statesman – may require more labour than usual
• XFORCE exhaust tips, require more time to be aligned properly

What's the Difference Between Exhaust Systems?

ENGINE/TURBO BACK

• The most comprehensive performance upgrade for your exhaust
• Generally replaces the headers, turbo manifold, cat converters, mufflers and piping all in one go
• Streamlines the entire exhaust system for optimal flow

CAT BACK

• The most common and price-conscious exhaust upgrade
• Connects to your vehicle using the stock catalytic converter, replacing the mufflers and piping that follow
• Gives a modest performance boost by streamlining the air flow as opposed to more restrictive stock tubes and mufflers

Delivery Costs:

• Please check on the cart page

Approximate Delivery Times After Dispatch (processing times can vary 1-3 business days)

Melbourne: 1-3 Business Days
Sydney/ACT: 1-3 Business Days
Brisbane: 1-3 Business Days
Adelaide: 1-3 Business Days
Perth: 4-9 Business Days
Country & Remote Areas: 4-16 Business Days

PLEASE NOTE: REMOTE & COUNTRY AREAS MAY INCUR EXTRA CHARGES

We want to get your order to you as quickly as possible. Please make sure you provide us with a valid delivery address and contact phone number so we can contact you if there are any issues with your consignment.

We pack every order carefully to ensure it reaches you in good condition. Your order will be sent through Australia Post or one of our preferred couriers.

Exhaust Shop Australia has a wide range of automotive parts. With full access to leading Australian exhaust manufacturers as well as others we ensure that you can get the best parts for your pride and joy. If you can’t find what you’re looking for send us a message and we will look further into what you need.

We're here to help 5 days a week!

• Phone: 03 9111 5481
• Email: help@exhaustshop.com.au

We understand that you might need to return something to us for a number of reasons. Please contact us before sending anything back.

Items must be returned to us via tracked postage or courier. Without a verifiable tracking number, you accept full risk of the item not reaching us. Returns not received by us will not qualify for replacement or refund.

a) Freight 

We can ship to virtually any address in Australia. We ship to your nominated address – once your order is ready, we will email you freight details including a tracking number.

b) Faulty Product

Exhaust Shop Australia will provide a replacement part or unit free of charge or refund the purchase price at our discretion for faulty products returned to us within 30 days of purchase date subject to: 

• Prior to returning the part or unit, you must contact us by phone or email

• The product having not been damaged or tampered with in any way

• Inspection and/or testing by us of the returned product

• Purchasers are responsible for shipping charges back to us

• Freight must be sent back with a trackable consignment number

c) Wrong Product

In the event of a purchaser having ordered the wrong product, Exhaust Shop Australia will at our discretion generally accept return of the product and credit the sale price excluding the actual shipping charge (this may be more than the original delivery charge incurred at time of order as we subsidise freight charges). The product must be unopened and in a re-sellable condition (has not been fitted to a vehicle). Credits are at the discretion of Exhaust Shop Australia and are subject to: 

• Prior to returning the part or unit, you must contact us by phone or email

• The product being shipped back to us within 7 days of receipt by the Purchaser. The cost of returning the product is the responsibility of the purchaser – we do not accept “receiver pays” shipments.

• The product and its packaging being “as new” when received back by us. We are unable to accept back exhaust systems that have been fitted to a vehicle.

• When sending back a part or unit we advise you to use a freight service that insures & tracks the part – we cannot be held responsible for it until it has been received back by us.

d) Special Orders

In the event that you would like to return a special order, we will not accept your request. Special orders include purchases with products that are made to order. If any the product is faulty please refer to section B for conditions

Exhaust Shop Australia has a wide range of exhaust systems, exhaust components and suspension parts. With full access to leading Australian exhaust manufacturers as well as others we ensure that you can get the best parts for your pride and joy.

If you can’t find what you’re looking for send us a message and we will look further into what you need.

We love hearing from our valued customers, so feel free to contact us any time.