Volvo 670 with 2250

[JimT]

Second that, 99.99999% chance it's a bad delete. Simply "turning off" some stuff isn't enough. Not jacking up the HP or torque is good, but some modification is needed to compensate for lack of EGR and plenty of other things that Rawze points out all the time.

And as Waterloo said, if those cans weren't COMPLETELY hollowed out, ALL 3 OF THEM, then you're headed for trouble!