Do diesels lose power with holed exhausts?

[dave.j.robbo]

Me again... Over the last few weeks, my truck's lost a bit of its 'oomph'..

Not really that noticable, but noticed that the boost is down slightly (I fitted a gauge ages ago..) The other day, I was poking around underneath the truck (to see my fuel leaking over the drive.. See other post..) and noticed the middle section of the exhaust is holed.

Would this cause a loss of power? I think I remember that 2 stroke engines rely on a bit of back pressure to help them run properly, and was wondering if such a thing might be the same on Turbo Diesels?

[mud skipper]

if it does then im introuble because mine only has half an exhaust pipe, from after the front box i have sawn mine off, i have no drop in performance and funny enough no real increase in exaust noise disspite lossing 5 foot of pipe and a silencer box, only prob is fumes when back door and sunroof open together.
john

[dirtydog]

i had a huge split in mine and it didnt really matter.