We have been testing the new GTX42-66 and 67mm chargers for quite sometime and they are phenomenal. The units flow 95lbs/min and support TONS of pressure and spool like an S300 even though the exhaust side is same as S400. The unit below is the 67mm unit and has about 60K HARD miles. Wanted to test it to see how she ran...... Call us now as we have a batch now in stock.