BLOX Racing’s 2.5″ exhaust donuts are back-in-stock and shipping.

BLOX Racing also offers exhaust donuts specifically for Subaru, including a wide array of other DIY products. The Performance DIY line is perfect for building and assembling your own high performance component. Experienced fabricators and performance hobbyists, alike, now can have access to the same high quality components that top manufacturers use when making their own products. Choose from various components that allow you to build your own exhaust header, turbocharger kit or performance exhaust system.

With BLOX Racing Performance DIY products, the only thing holding you back is your imagination.


BLOX Racing Ti exhaust headers are made using Grade 1 titanium. Grade 1 is the purest blox-headers-4form available commercially and is the perfect choice for high end motorsports and racing products.

In general, titanium headers are available in Hi-Flo and Max-Flo (2-pc, 4-2-2-1 Tri-Y) for B-series engines and a K-Swap (2-pc, 4-2-1 Tri-Y) application for K-series engines in EG, EK and DC chassis. Each Ti header is handmade and hand TIG-welded; features stepped tubing; laser-cut flanges measuring 8mm (at cylinder head and at collector). Wall thickness measures 1mm. BLOX Racing matches cylinders 1&3, 2&4 together.

BXEX-00500-TI, Hi-Flo: 42mm – 45mm – 51mm; 6.20lbs
BXEX-00501-TI, Max-Flo: 45mm – 50mm – 55mm; 6.50lbs
BXEX-00510-TI, K-Swap: 49mm – 51mm – 56mm; 6.45lbs

For more product details and pricing, please visit our Exhaust Header product section on our website.