The following changes have been updated in the 2013 V8 Thunderstock rules.
- Exhaust: Stock exhaust manifold or Hedman Street Series with 3 inch collector No other type of header will be allowed. Headman Street Series with 3 inch collector ONLY.
- Body panels. Stock body panels or self made body panels (alum) or metal only that are as close to stock appearing as possible with no sharp edges or protrusions.
For complete rules visit the Thunderstock Rules Section