.product-accordion { font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; max-width: 100%; border-top: 1px solid #e5e5e5; margin-top: 20px; text-align: left; } .accordion-item { border-bottom: 1px solid #e5e5e5; } .accordion-header { background: #fff; color: #000; cursor: pointer; padding: 18px 0; width: 100%; border: none; text-align: left; font-size: 13px; font-weight: bold; letter-spacing: 1.5px; text-transform: uppercase; display: flex; justify-content: space-between; align-items: center; outline: none; } .accordion-header:after { content: '+'; font-size: 18px; color: #000; } .accordion-item.active .accordion-header:after { content: '-'; } .accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.3s ease-out; } .accordion-content-inner { padding: 0 0 25px 0; font-size: 14px; line-height: 1.6; color: #333; text-align: left; } .accordion-content-inner ul { margin: 10px 0; padding-left: 20px; } Description B58 4.5″ Catless Downpipe BMW B58 (2016–2023) Unlock maximum performance and sound from your BMW with the B58 4.5″ Catless Downpipe, engineered for high-output B58 engines. Designed to significantly improve exhaust flow, this downpipe reduces backpressure and allows the turbocharger to spool faster, resulting in sharper throttle response and increased power potential. The large 4.5-inch diameter construction is ideal for tuned and high-performance setups, delivering a more aggressive exhaust note while supporting higher boost levels. By removing the restrictive factory catalytic converter, this downpipe maximizes efficiency and performance across the entire rev range. Manufactured from high-grade materials and precision-formed for a clean, performance-focused fit, this catless downpipe is a key upgrade for enthusiasts seeking uncompromised power and sound from their B58 platform. Key Features 4.5″ large-diameter catless downpipe design Maximizes exhaust flow and turbo efficiency Faster turbo spool and improved throttle response Increased power potential for tuned setups High-quality construction with performance-focused design Aggressive exhaust sound Kavoni Design Quality At Kavoni Design, we select performance components that deliver real results. This B58 4.5″ catless downpipe meets our standards for quality, performance, and durability, offering a no-compromise upgrade for serious B58 builds. Shipping & Returns This product is made to order. Please allow 12–14 business days for production. Orders are shipped worldwide after production is completed. Worldwide shipping: 6–8 business days Returns are accepted within 14 days of delivery for unused items in original condition. Return shipping costs are the responsibility of the customer. Fitment Not sure if this downpipe is compatible with your specific BMW B58 setup? Contact our sales team and we will be happy to assist you in selecting the correct configuration. Warranty Every product from Kavoni Design comes with a 12-month warranty. This warranty covers manufacturing defects under normal use. Damage caused by improper installation, excessive heat, or racing use is not covered. Disclaimer This product is an aftermarket performance component and is not road legal in all regions. Professional installation and ECU tuning may be required. Kavoni Design is not responsible for damages incurred during or after installation. function toggleAccordion(element) { const item = element.parentElement; const content = element.nextElementSibling; const allItems = document.querySelectorAll('.accordion-item'); allItems.forEach(i => { if (i !== item) { i.classList.remove('active'); i.querySelector('.accordion-content').style.maxHeight = null; } }); item.classList.toggle('active'); if (item.classList.contains('active')) { content.style.maxHeight = content.scrollHeight + "px"; } else { content.style.maxHeight = null; } }
