Yea, your loosing a decent chunk of hp because that's up high. Back pressure is a big key to hp and hp loss. Exhaust leaks are a head ache and with it leaking by the headers make sure yur not gunna melt anything...
1957 Buick Special Estate Wagon
1996 Mustang GT (sold)
1997 Mustang V6 (sold)
2002 Jeep Grand Cherokee Laredo (sold)
2007 Jeep Grand Cherokee