engine runs good smooth healthy.......but one problem i have is that the boost doesnt respond as good sometimes.......when i turn it off for a while and then get in it turn it on and temperature is about 140 150 range and the boost responds great but after driving it for like 5 min the boost isnt as powerful anymore like it hesitates and the boost only creeps up as the rpms go up.... i had 680s on there but went back to stock soo its pretty much stock, stock downpipe and stock exhaust only thing is just an air filter any ideas??????