This slash cut tailpipe version of our M135i backbox delete adds a sporty look to the rear end of your 1 Series, making it an excellent performance and aesthetic upgrade. Direnza Brushed Backbox Deletes are manufactured from T304 grade brushed steel, handcrafted by our specialist Direnza engineering team to ensure a safe and secure fit every time. A direct replacement for the stock backbox, Direnza mandrel-bent exhaust components are fully TIG welded and feature CNC-machined flanges for strength and durability. Engineered to not only improve power and torque across the entire RPM range but Direnza exhaust components improve throttle response to help you push further and faster on the road or the track.

At Direnza we offer you our best prices but to do this all our website prices only include delivery to the UK mainland. If your delivery address is outside the UK mainland please be aware there may be additional shipping charges. If this is the case; we will contact you before any payment is processed.

We aim to dispatch all orders within 3 working days. If there is going to be a delay with dispatching your order we will contact you to advise you of this.

We buy all our products in bulk in order to keep prices low and ensure we always have what you’re looking for in stock. However there may be occasions we are out of stock of a product you have ordered. If this is the case we will notify you as soon as possible and refund any payments made for the product in question.

Any goods found to be faulty within 12 months of purchase will be repaired and where this is not possible, replaced. Please be aware that Direnza will not be held responsible for any labour costs incurred for fitting of our products whether faulty or not.

Please note all items must be installed by a qualified mechanic at a registered garage. Failure to do this will invalidate any warranty and returns policy. For information on warranty offered on your purchase, please either contact us by email at sales@direnza.co.uk or phone us on +44 (0) 844 448 2002.

Along with this, if you no longer require any items within your order, you have 14 days after delivery to cancel your order and return the goods back to us. All of our products are made with the highest quality materials and checked prior to dispatching.

If you have any issues with your product, you have the right to contact us and for us to get the issue resolved, in accordance of the Consumer Rights Act 2015.