These units are built to be 100% drop in’s, no physical modifications required. Spool time, in any form built will be similar to your OEM unit. The larger you go the less desirable it will be to tow and the less friendly it will become in a daily driver situation. In most all cases 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.
These turbochargers are extremely loud!