Originally Posted by jameshughes1974
If you don't have a welder you could run core drill up it to the dpf cat join.
Would have to make sure no sensors got chopped.
Core drills cut through bricks. Wouldn't have thought the dpf substrate would give too many issues
I know it's been done on other car makes
This works a treat
I did it on mine this weekend as a last ditched attempt to get rid of sluggish performance and because there were no more types of additives left to try.
I left some of the front of the DPF in place, maybe an inch or two, and only made a hole probably 1.5 - 2 inches in diameter up till there. (and a few random holes drilled roughly down the sides for good measure)
It has completely transformed the car from being a leisurely slouch (until pushed hard) to feeling a lot more responsive.
Add to it that you don't need to bother with a bypass pipe or interferw with sensors or remapping, it works really well.
I've checked for errors every day so far and there's none. Mpg is up an honest 10% too.
I used a 15mm masonry bit, 45cm long. I didn't bother removing the dpf either, I just disconnected the rear exhaust section from the back of the back of the dpf can and drilled up through there. The best mod I've made, and cost me nothing. No additive can make this sort of improvement
I started the engine and revved it a few times before reconnecting the exhaust, to blow out the dust. All in all it took 15 minutes. If you disconnect the battery first before you start then the ECU will reset and be ready to start learning the new parameters when you're finished underneath the car. (You might need your radio code to hand, so skip disconnecting the battery if you haven't got it !)
All I'll say is to be sure the dpf is blocked before you start and you don't have another reason for sluggishness hiding in there somewhere. once I removed the temperature probe from the DPF and started the car I could tell from the huge amount of pressure escaping the hole where the sensor goes that the filter must be almost fully clogged.
It seems far too easy and like there must be a catch. Things aren't usually so easy, but, this looks like it is.