Increase bottom end torque by increasing runner length and reduce heat this summer on your Holden V6 with our range of 5MM Gasket Spacers.

Comes with optional sealant or 4 x Metal Gaskets to seal top and bottom.
 
Please note: Anything bigger than 5MM is going to decrease your TOP end power, whilst not necessarily a bad thing, as you increase RUNNER length you shift the torque curve lower. More torque between idle to 3000RPM but less torque from 4500RPM onwards. You can double-stack these if you require more.
 
Anything bigger than a 10MM requires bigger bolts. The biggest we recommend is 12MM. Anything bigger than this requires fine-tuning as you have now shifted the runners so much that your fuel trims are going to be out, you will be running rich in low to mid-range and lean at the top end. Source 15 years of Alloytec tuning.