Can be extremely difficult to unroll when first delivered; many users recommend letting it warm up or adding heavy weights to flatten it.
Features a "4/7 swap" firing order to optimize performance in high-compression Super-Comp racing setups. : Aggressive profile requires a high compression ratio ( ) to work effectively. Not legal for street use on emissions-controlled vehicles. 124183
: Highly rated for its extreme thickness and durability, though it requires patience to unroll and flatten. Positives : Exceptionally thick and heavy-duty. Can be extremely difficult to unroll when first