Raceworks Aluminium Donut 3.5in Tube Pipe - ITD-350H. The ITD-350H model stands out as a versatile and essential component for any serious intake, turbo, or exhaust setup. Whether you're building your dream car or upgrading your current setup, the Raceworks Aluminium Donut 3.5in Tube Pipe (Product Code: ITD-350H) is the perfect addition to enhance performance, efficiency, and overall vehicle responsiveness.