Combining a Garrett GTX4202R ball bearing turbocharger featuring a 75mm inducer compressor and a 105mm inducer turbine with a Garrett GT3788R ball bearing charger that has a 64mm inducer compressor and a 68mm inducer turbine means more power and higher fuel efficiency. Ball bearing chargers provide considerably less resistance than thrust bearing chargers. Lower resistance means reduced turbo lag and significantly improved drivability during a daily commute. BT Diesel twins do not use silicone boots and every connection is made with grooved O-rings and sealed with a hard V-band clamp, which lowers the probability of leaks or pressure loss until air enters the intercooler. Big Twin Diesel has been in operation since 2006 and has a reputation for excellence. Their goal is serve customers who need improved gas mileage and higher performance for their diesel vehicles with high-quality parts and labor that is dependable.