They spool quick and it is hard to keep out of boost. I have only 500 more miles until I can turn it up. New block installed at same time.....break-in period ya know
As far as the downpipes, Greg Dupree's work great but you have to take off the wastegate seperators because the exhaust side is already seperated.
Dallas DamonZ installed them for me and I know he had to fabricate a few things, you may want to shoot him an email.