Banks Power 04-05 Chevy 6.6L LLY Techni-Cooler SystemOptimizes the boosted air density for higher continuous power and lower exhaust gas temps. Restriction free for superior flow with 25% larger core area and 34% more volume. Big boost tubes & durable cast end tanks pack cool, dense air into cylinders. Cooler EGTs, more MPG & constant duty power. It doesn't get any cooler than Techni Cooler. More Safe Power. It's all bigger: 3. 5" mandrel bent boost tubes, aluminum end tanks, wide open inlet and outlet