IAG Performance 8mm Phenolic Spacer KitIAG Performance is proud to offer 8mm phenolic grade CE spacers for your Subaru 2. 0L and 2. 5L engine. This is a simple, cost effective way to maximize the power of your current set up. The 8mm spacer offers superior thermal insulation and also aids in raising the intake manifold*. This can be useful when plumbing custom intercooler piping or rotating the intake manifold. Why it works: The concept behind the phenolic spacer is simple: isolate the