I've just cut the centre cat out of my system, and replaced it with a piece of 400mm x 57mm stainless (£5!), nicely mig'd all the way round.
Felt the difference in torque immediately and am now looking to replace the pre-cat.
Scorpion seem to be the only people to offer the precat decat pipe, it's £150 so I thought I'd see if anyone has tried it first! Dont want to spend that money an waste probably 4 hours fitting it if it has an adverse/no effect.
Any help/advice would be great thanks, Dave.
2006 SRI 150 1.9 CDTI VECTRA (No dpf model)