These units are built to be 100% drop in’s, no physical modifications required. All of these units are built with our exclusive race covers. Spool time, in any size built will be similar to your OEM unit as these are still small frame turbochargers. The larger you go the less desirable it will become while towing and the less friendly it will be stop light to stop light. In most all builds this style of turbocharger allows your truck to still be a truck and not just a toy. Turbos like this can be used in stock to wild applications. It is however very important to understand that the more extreme you get with a turbocharger, the shorter its service life can be. Bigger does not always mean better.