Tech Guides

Diverter valve, blow off valve, bypass valve, BOV — same job, different exit. Here's how they actually differ, why your factory valve is the weak link, and how to pick the right GFB valve for your ...

A practical comparison of genuine OEM cooling fans and SPAL performance fans, covering airflow, shroud design, brushless motor technology and temperature control. Includes guidance on choosing the ...

A practical comparison of Hardrace hardened rubber bushings and pillow ball (spherical) bearings, covering how each design affects deflection, noise and handling. Includes guidance on choosing for ...

Why factory plastic-tank radiators fail at 8-10 years, why repairs don't hold long-term, and what makes a quality all-aluminium performance radiator worth the upgrade.

R-Series, V-Core, Hyper V-Core, N-Flo, HH Series - KOYORAD's lineup looks overwhelming until you understand what each one does. This guide breaks down the real engineering differences, when each se...

Both Civic Type Rs are brilliant, but once you start modifying them, the FK8 and FL5 diverge in ways the spec sheet doesn't show. From the MAF sensor change nobody talks about to which parts actual...

The PRL HVI ships with a choice of two billet MAF housings - Street MAF and Race MAF. Get it wrong and you'll either leave power on the table or trigger check engine lights. Here's exactly how to c...

Injector Dynamics has officially released the full X-Series range for the Toyota GR Yaris and GR Corolla - ID1050-XDS, ID1300-XDS and ID1750-XDS. This buyer's guide breaks down each injector, who i...

Just fitted a set of AST or MOTON coilovers? This guide walks you through exactly how to adjust 1-way, 2-way, and 3-way dampers - no engineering jargon, just where the knobs are, which way to turn ...